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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	ADPT
Entity Registrant Name	ADAPTIVE BIOTECHNOLOGIES CORPORATION
Entity Central Index Key	0001478320
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		124,287,992
Entity Current Reporting Status	No
Entity Shell Company	false
Entity File Number	001-38957
Entity Tax Identification Number	270907024
Entity Address, Address Line One	1551 Eastlake Avenue East
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Seattle
Entity Address, State or Province	Washington
Entity Address, Postal Zip Code	98102
City Area Code	(206)
Local Phone Number	659-0067

Condensed Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 48,458,000	$ 55,030,000
Short-term marketable securities	374,543,000	109,988,000
Accounts receivable, net	7,252,000	4,807,000
Inventory	8,004,000	7,838,000
Prepaid expenses and other current assets	4,044,000	3,055,000
Total current assets	442,301,000	180,718,000
Long-term assets
Property and equipment, net	22,298,000	19,125,000
Restricted cash and other assets	5,040,000	247,000
Intangible assets, net	12,784,000	13,626,000
Goodwill	118,972,000	118,972,000
Total assets	601,395,000	332,688,000
Current liabilities
Accounts payable	2,944,000	1,793,000
Accrued liabilities	5,019,000	2,562,000
Accrued compensation and benefits	4,429,000	4,641,000
Current portion of deferred rent	1,276,000	1,109,000
Current deferred revenue	61,194,000	12,695,000
Total current liabilities	74,862,000	22,800,000
Long-term liabilities
Convertible preferred stock warrant liability	2,602,000	336,000
Deferred rent liability, less current portion	5,455,000	6,102,000
Deferred revenue, less current portion	240,919,000	704,000
Total liabilities	323,838,000	29,942,000
Commitments and contingencies (Note 8)
Convertible preferred stock: $0.0001 par value, 93,762,517 shares authorized at June 30, 2019 and December 31, 2018, respectively; 93,039,737 and 92,790,094 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively; aggregate liquidation preference of $574,374 and $572,866 at June 30, 2019 and December 31, 2018, respectively	561,931,000	560,858,000
Shareholders’ deficit
Common stock: $0.0001 par value, 131,000,000 shares authorized at June 30, 2019 and December 31, 2018, respectively; 13,725,381 and 12,841,536 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	1,000	1,000
Additional paid-in capital	46,160,000	37,902,000
Accumulated other comprehensive gain (loss)	382,000	(107,000)
Accumulated deficit	(330,917,000)	(295,908,000)
Total shareholders’ deficit	(284,374,000)	(258,112,000)
Total liabilities, convertible preferred stock and shareholders’ deficit	$ 601,395,000	$ 332,688,000

Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Convertible preferred stock par value	$ 0.0001	$ 0.0001
Convertible preferred stock authorized	93,762,517	93,762,517
Convertible preferred stock issued	93,039,737	92,790,094
Convertible preferred stock outstanding	93,039,737	92,790,094
Convertible preferred stock aggregate liquidation preference	$ 574,374	$ 572,866
Common stock par value	$ 0.0001	$ 0.0001
Common stock authorized	131,000,000	131,000,000
Common stock issued	13,725,381	12,841,536
Common stock outstanding	13,725,381	12,841,536

Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue
Total revenue	$ 22,138	$ 11,568	$ 34,804	$ 21,283
Operating expenses
Cost of revenue	5,734	5,044	10,722	9,033
Research and development	16,527	9,452	29,010	18,307
Sales and marketing	8,897	5,329	16,714	10,376
General and administrative	6,662	4,632	13,666	9,175
Amortization of intangible assets	423	424	842	843
Total operating expenses	38,243	24,881	70,954	47,734
Loss from operations	(16,105)	(13,313)	(36,150)	(26,451)
Interest and other income, net	446	820	2,105	1,567
Net loss	(15,659)	(12,493)	(34,045)	(24,884)
Fair value adjustment to Series E-1 convertible preferred stock options	(710)	(2)	(964)	2
Net loss attributable to common shareholders	$ (16,369)	$ (12,495)	$ (35,009)	$ (24,882)
Net loss per share attributable to common shareholders, basic and diluted	$ (1.23)	$ (1.01)	$ (2.68)	$ (2.02)
Weighted-average shares used in computing net loss per share attributable to common shareholders, basic and diluted	13,279,324	12,385,888	13,074,692	12,334,227
Sequencing Revenue
Revenue
Total revenue	$ 11,865	$ 8,281	$ 17,948	$ 14,061
Development Revenue
Revenue
Total revenue	$ 10,273	$ 3,287	$ 16,856	$ 7,222

Condensed Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Financial Position [Abstract]
Net loss	$ (15,659)	$ (12,493)	$ (34,045)	$ (24,884)
Change in unrealized gain (loss) on investments	290	43	489	(74)
Comprehensive loss	$ (15,369)	$ (12,450)	$ (33,556)	$ (24,958)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Statements of Convertible Preferred Stock and Shareholders' Deficit - USD ($) $ in Thousands	Total	Convertible Preferred Stock	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive (loss) Income	Accumulated Deficit
Beginning Balance at Dec. 31, 2017	$ (224,616)		$ 1	$ 24,972	$ (166)	$ (249,423)
Beginning Balance, Shares at Dec. 31, 2017			12,208,731
Convertible preferred stock, Beginning Balance at Dec. 31, 2017		$ 561,333
Convertible preferred stock, Beginning Balance, Shares at Dec. 31, 2017		92,656,029
Adjustments to accumulated deficit for adoption of guidance on accounting for share-based payment transactions (unaudited)				140		(140)
Issuance of common stock for cash upon exercise of stock options (unaudited)	823			823
Issuance of common stock for cash upon exercise of stock options (unaudited), Shares			338,113
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited)		$ 100
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited), Shares		134,065
Vested Series E-1 convertible preferred stock option forfeitures (unaudited)	767			476		291
Vested Series E-1 convertible preferred stock option forfeitures (unaudited)		$ (767)
Series E-1 convertible preferred stock option share-based compensation (unaudited)	3			3
Adjustment to redemption value for vested Series E-1 convertible preferred stock options (unaudited)	(3)			(3)
Adjustment to redemption value for vested Series E-1 convertible preferred stock options (unaudited)		3
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)	2					2
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)		(2)
Common stock option share-based compensation (unaudited)	5,547			5,547
Other comprehensive income (unaudited)	(74)				(74)
Net loss	(24,884)					(24,884)
Convertible preferred stock, Ending Balance at Jun. 30, 2018		$ 560,667
Convertible preferred stock, Ending Balance, Shares at Jun. 30, 2018		92,790,094
Ending Balance at Jun. 30, 2018	(242,435)		$ 1	31,958	(240)	(274,154)
Ending Balance, Shares at Jun. 30, 2018			12,546,844
Beginning Balance at Mar. 31, 2018	(233,612)		$ 1	28,620	(283)	(261,950)
Beginning Balance, Shares at Mar. 31, 2018			12,301,844
Convertible preferred stock, Beginning Balance at Mar. 31, 2018		$ 561,396
Convertible preferred stock, Beginning Balance, Shares at Mar. 31, 2018		92,745,734
Issuance of common stock for cash upon exercise of stock options (unaudited)	415			415
Issuance of common stock for cash upon exercise of stock options (unaudited), Shares			245,000
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited)		$ 35
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited), Shares		44,360
Vested Series E-1 convertible preferred stock option forfeitures (unaudited)	767			476		291
Vested Series E-1 convertible preferred stock option forfeitures (unaudited)		$ (767)
Series E-1 convertible preferred stock option share-based compensation (unaudited)	1			1
Adjustment to redemption value for vested Series E-1 convertible preferred stock options (unaudited)	(1)			(1)
Adjustment to redemption value for vested Series E-1 convertible preferred stock options (unaudited)		1
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)	(2)					(2)
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)		2
Common stock option share-based compensation (unaudited)	2,447			2,447
Other comprehensive income (unaudited)	43				43
Net loss	(12,493)					(12,493)
Convertible preferred stock, Ending Balance at Jun. 30, 2018		$ 560,667
Convertible preferred stock, Ending Balance, Shares at Jun. 30, 2018		92,790,094
Ending Balance at Jun. 30, 2018	(242,435)		$ 1	31,958	(240)	(274,154)
Ending Balance, Shares at Jun. 30, 2018			12,546,844
Beginning Balance at Dec. 31, 2018	(258,112)		$ 1	37,902	(107)	(295,908)
Beginning Balance, Shares at Dec. 31, 2018			12,841,536
Convertible preferred stock, Beginning Balance at Dec. 31, 2018	$ 560,858	$ 560,858
Convertible preferred stock, Beginning Balance, Shares at Dec. 31, 2018	92,790,094	92,790,094
Issuance of common stock for cash upon exercise of stock options (unaudited)	$ 1,880			1,880
Issuance of common stock for cash upon exercise of stock options (unaudited), Shares			883,845
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited)		$ 109
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited), Shares		249,643
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)	(964)					(964)
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)		$ 964
Common stock option share-based compensation (unaudited)	6,378			6,378
Other comprehensive income (unaudited)	489				489
Net loss	(34,045)					(34,045)
Convertible preferred stock, Ending Balance at Jun. 30, 2019	$ 561,931	$ 561,931
Convertible preferred stock, Ending Balance, Shares at Jun. 30, 2019	93,039,737	93,039,737
Ending Balance at Jun. 30, 2019	$ (284,374)		$ 1	46,160	382	(330,917)
Ending Balance, Shares at Jun. 30, 2019			13,725,381
Beginning Balance at Mar. 31, 2019	(273,474)		$ 1	40,981	92	(314,548)
Beginning Balance, Shares at Mar. 31, 2019			12,930,536
Convertible preferred stock, Beginning Balance at Mar. 31, 2019		$ 561,210
Convertible preferred stock, Beginning Balance, Shares at Mar. 31, 2019		93,023,694
Issuance of common stock for cash upon exercise of stock options (unaudited)	1,847			1,847
Issuance of common stock for cash upon exercise of stock options (unaudited), Shares			794,845
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited)		$ 11
Issuance of Series E-1 convertible preferred stock for cash upon exercise of Series E-1 convertible preferred stock options at fair value (unaudited), Shares		16,043
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)	(710)					(710)
Change in redemption value for vested Series E-1 convertible preferred stock options (unaudited)		$ 710
Common stock option share-based compensation (unaudited)	3,332			3,332
Other comprehensive income (unaudited)	290				290
Net loss	(15,659)					(15,659)
Convertible preferred stock, Ending Balance at Jun. 30, 2019	$ 561,931	$ 561,931
Convertible preferred stock, Ending Balance, Shares at Jun. 30, 2019	93,039,737	93,039,737
Ending Balance at Jun. 30, 2019	$ (284,374)		$ 1	$ 46,160	$ 382	$ (330,917)
Ending Balance, Shares at Jun. 30, 2019			13,725,381

Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Condensed Statements of Cash Flows - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net loss	$ (34,045)	$ (24,884)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation expense	2,811	2,099
Share-based compensation expense	6,378	5,550
Intangible assets amortization	842	843
Investment amortization	(1,896)	(459)
Gain on equipment disposals	(79)	(41)
Fair value adjustment of convertible preferred stock warrant	2,266
Other	1	3
Changes in operating assets and liabilities:
Accounts receivable, net	(2,445)	1,165
Inventory	(166)	(2,921)
Prepaid expenses and other current assets	(883)	(364)
Accounts payable and accrued liabilities	1,314	(1,013)
Deferred rent	(480)	(359)
Deferred revenue	288,714	5,425
Other	1	(207)
Net cash provided by (used in) operating activities	262,333	(15,163)
Investing activities
Purchases of property and equipment	(5,354)	(1,614)
Proceeds from sales of equipment		19
Purchases of marketable securities	(358,671)	(110,947)
Proceeds from maturities of marketable securities	96,500	80,516
Net cash used in investing activities	(267,525)	(32,026)
Financing activities
Proceeds from exercise of stock options	1,989	923
Payment of deferred initial public offering costs	(3,360)
Other	(9)	(10)
Net cash (used in) provided by financing activities	(1,380)	913
Net decrease in cash, cash equivalents and restricted cash	(6,572)	(46,276)
Cash, cash equivalents and restricted cash at beginning of year	55,091	85,366
Cash, cash equivalents and restricted cash at end of period	48,519	39,090
Noncash investing and financing activities
Purchases of equipment included in accounts payable and accrued liabilities	1,490	$ 535
Deferred offering costs included in accounts payable and accrued expenses	$ 1,433

Organization and Description of Business

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Description of Business

1.	Organization and Description of Business

Adaptive Biotechnologies Corporation (“we,” “us” or “our”) is a commercial-stage company advancing the field of immune-driven medicine by harnessing the inherent biology of the adaptive immune system to transform the diagnosis and treatment of disease. We believe the adaptive immune system is nature’s most finely tuned diagnostic and therapeutic for most diseases, but the inability to decode it has prevented the medical community from fully leveraging its capabilities. Our immune medicine platform is the foundation for our expanding suite of products and services. The cornerstone of our immune medicine platform and core immunosequencing product, immunoSEQ, serves as our underlying research and development engine and generates revenue from academic and biopharmaceutical customers. Our first clinical diagnostic product, clonoSEQ, is the first test authorized by the Food and Drug Administration (“FDA”) for the detection and monitoring of minimal residual disease (“MRD”) in patients with select blood cancers.

We were incorporated in the State of Washington on September 8, 2009 under the name Adaptive TCR Corporation. On December 21, 2011, we changed our name to Adaptive Biotechnologies Corporation. We are headquartered in Seattle, Washington.

Initial Public Offering

Our registration statement on Form S-1 related to our initial public offering (“IPO”) was declared effective on June 26, 2019, and our common stock began trading on the Nasdaq Global Select Market on June 27, 2019. On July 1, 2019, we completed our IPO in which we issued and sold 17,250,000 shares of common stock, including shares issued upon the exercise in full of the underwriters’ over-allotment option, at a public offering price of $20.00. We received approximately $316.0 million in net proceeds, after deducting underwriting discounts and commission of approximately $24.2 million and offering expenses of approximately $4.8 million.

Immediately prior to the completion of our IPO on July 1, 2019, 93,039,737 shares of convertible preferred stock then outstanding converted into an equivalent number of shares of common stock. On July 1, 2019, in connection with the closing of our IPO, our amended and restated articles of incorporation, as filed with the Secretary of State of the State of Washington, and our amended and restated bylaws became effective. Also on July 1, 2019, we adopted a new equity incentive plan (“2019 Plan”), establishing an initial reserve of 15,519,170 shares under the 2019 Plan.

The condensed financial statements as of June 30, 2019, including share and per share amounts, do not give effect to our IPO as it closed subsequent to June 30, 2019.

Significant Accounting Policies

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Significant Accounting Policies

2.	Significant Accounting Policies

Basis of Presentation and Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenues and expenses during the periods presented. We base our estimates on historical experience and other relevant assumptions that we believe to be reasonable under the circumstances. Estimates are used in several areas including, but not limited to, estimates of progress to date for certain performance obligations and the transaction price for certain contracts with customers, share-based compensation including the fair value of stock, and the provision for income taxes, including related reserves, and goodwill, among others. These estimates generally involve complex issues and require judgments, involve the analysis of historical results and prediction of future trends, can require extended periods of time to resolve and are subject to change from period to period. Actual results may differ materially from management’s estimates.

Unaudited Interim Condensed Financial Statements

In our opinion, the accompanying unaudited condensed financial statements have been prepared in accordance with GAAP for interim financial information. These unaudited condensed financial statements include all adjustments necessary to fairly state the financial position and the results of our operations and cash flows for interim periods in accordance with GAAP. Interim-period results are not necessarily indicative of results of operations or cash flows for a full year or any subsequent interim period.

The accompanying condensed financial statements should be read in conjunction with our audited financial statements and notes included in our prospectus dated June 26, 2019 filed with the Securities and Exchange Commission (“SEC”) on June 27, 2019 in connection with our IPO (“Prospectus”).

Cash and Cash Equivalents

Cash and cash equivalents are stated at fair value. Cash equivalents include only securities having an original maturity of three months or less at the time of purchase. We limit our credit risk associated with cash and cash equivalents by placing our investments with banks that we believe are highly creditworthy and with highly rated money market funds. Cash and cash equivalents primarily consist of bank deposits and investments in money market funds, as well as highly liquid U.S. government debt and agency securities and commercial paper with original maturities of three months or less.

Concentrations of Risk

We are subject to a concentration of risk from a limited number of suppliers, or in some cases, single suppliers for some of our laboratory instruments and materials. This risk is managed by targeting a quantity of surplus stock.

Cash, cash equivalents and marketable securities are financial instruments that potentially subject us to concentrations of credit risk. We invest in money market funds, U.S. government debt securities, U.S. government agency bonds, commercial paper and corporate bonds with high-quality accredited financial institutions.

Significant customers are those which represent more than 10% of our total revenue or accounts receivable balance at each respective balance sheet date. Revenue from these customers reflects their purchase of our products and services and we do not believe their loss would have a material adverse effect on our business.

For each significant customer, revenue as a percentage of total revenue and accounts receivable, net as a percentage of total accounts receivable, net were as follows:

Revenue

Accounts Receivable, Net

Three Months Ended June 30,

Six Months Ended

June 30,

December 31,

2019

2018

2019

2018

2019

2018

(unaudited)

Customer A

12.7%

25.5%

26.4%

32.7%

Customer B

11.0

15.1

Customer C

13.2

Genentech, Inc.

40.0

43.6

* less than 10%

Revenue Recognition

We recognize revenue in accordance with Accounting Standards Codification (“ASC”) Topic 606 (“ASC 606”), Revenue from Contracts with Customers. Under ASC 606, for all revenue-generating contracts, we perform the following steps to determine the amount of revenue to be recognized: (i) identify the contract or contracts; (ii) determine whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract; (iii) measure the transaction price, including the constraint on variable consideration; (iv) allocate the transaction price to the performance obligations based on estimated selling prices; and (v) recognize revenue when (or as) we satisfy each performance obligation. The following is a summary of the application of the respective model to each of our revenue classifications.

Overview

Our revenue is generated from immunosequencing (“sequencing”) products and services (“sequencing revenue”) and from regulatory or development support services leveraging our immune medicine platform (“development revenue”). When revenue generating contracts have elements of both sequencing revenue and development revenue, we allocate revenue based on the nature of the performance obligation and the allocated transaction price.

Sequencing Revenue

Sequencing revenue reflects the amounts generated from providing sequencing services and testing through our immunoSEQ and clonoSEQ products and services to our research and clinical customers, respectively.

For research customers, contracts typically include an amount billed in advance of services (“upfront”), and subsequent billings as sample results are delivered to the customer. Upfront amounts received are recorded as deferred revenue, which we recognize as revenue upon satisfaction of performance obligations. We have identified two typical performance obligations under the terms of our

research service contracts: sequencing services and related data analysis. We recognize revenue for both identified performance obligations as sample results are delivered to the customer.

For other research customers who choose to purchase a research use only kit, the kits are sold on a price per kit basis with amounts payable upon delivery of the kit. Payments received are recorded as deferred revenue. For these customers, we have identified one performance obligation: the delivery of sample results. We recognize revenue as the results are delivered to the customer based on a proportion of the estimated samples that can be reported on for each kit.

For clinical customers, we derive revenues from providing our clonoSEQ test report to ordering physicians, and we bill and receive payments from commercial third-party payors and medical institutions. In these transactions, we have identified one performance obligation: the delivery of a clonoSEQ report. As payment from the respective payors may vary based on the various reimbursement rates and patient responsibilities, we consider the transaction price to be variable and record an estimate of the transaction price, subject to the constraint for variable consideration, as revenue at the time of delivery. The estimate of transaction price is based on historical reimbursement rates with the various payors, which are monitored in subsequent periods and adjusted as necessary based on actual collection experience.

In January 2019, clonoSEQ received Medicare coverage aligned with the FDA label and National Comprehensive Cancer Network (“NCCN”) guidelines for longitudinal monitoring in multiple myeloma (“MM”) and B cell acute lymphoblastic leukemia (“ALL”). We bill Medicare for an episode of treatment when we deliver the first eligible test results. This billing contemplates all necessary tests required during a patient’s treatment cycle, which is currently estimated at approximately four tests per patient, including the initial sequence identification test. Revenue is recognized at the time the initial billable test result is delivered and is based upon cumulative tests delivered to date. For the three and six months ended June 30, 2019, we recognized $0.3 million and $0.8 million relating to the coverage policy, respectively; $0.1 million and $0.4 million of this revenue was related to tests delivered in periods prior to the three and six months ended June 30, 2019, respectively. Any unrecognized revenue from the initial billable test is recorded as deferred revenue, and is recognized as we deliver the remaining tests in a patient’s treatment cycle.

Development Revenue

We derive revenue by providing services through development agreements to biopharmaceutical customers who seek access to our immune medicine platform technologies. We generate revenues from the delivery of professional support activities pertaining to the use of our proprietary immunoSEQ and clonoSEQ services in the development of the respective customers’ initiatives. The transaction price for these contracts may consist of a combination of non-refundable upfront fees, separately priced sequencing fees, progress based milestones and regulatory milestones. The development agreements may include single or multiple performance obligations depending on the contract. For certain contracts, we may perform services to support the biopharmaceutical customers’ regulatory submission as part of their registrational trials. These services include regulatory support pertaining to our technology intended to be utilized as part of the submission, development of analytical plans for our sequencing data, participation on joint research committees and assistance in completing a regulatory submission. Generally, these services are not distinct within the context of the contract, and they are accounted for as a single performance obligation.

When sequencing services are separately priced customer options, we assess if a material right exists and, if not, the customer option to purchase additional sequencing services is not considered part of the contract. Except for any non-refundable upfront fees, the other forms of compensation represent variable consideration. Variable consideration related to progress based and regulatory milestones is estimated using the most likely amount method where variable consideration is constrained until it is probable that a significant reversal of cumulative revenue recognized will not occur. Progress milestones such as the first sample result delivered or final patient enrollment in a customer trial are customer dependent and are included in the transaction price when the respective milestone is probable of occurring. Milestone payments that are not within our customers’ control, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. Determining whether regulatory milestone payments are probable is an area that requires significant judgment. In making this assessment, we evaluate the scientific, clinical, regulatory and other risks that must be managed, as well as the level of effort and investment required to achieve the respective milestone.

The primary method used to estimate standalone selling price for performance obligations is the adjusted market assessment approach. Using this approach, we evaluate the market in which we sell our services and estimate the price that a customer in that market would be willing to pay for our services. We recognize revenue using either an input or output measure of progress that faithfully depicts performance on a contract, depending on the contract. The measure used is dependent on the nature of the service to be provided in each contract. Selecting the measure of progress and estimating progress to date requires significant judgment.

Deferred Offering Costs

Deferred offering costs consist of fees and expenses incurred in connection with the anticipated sale of our common stock in the IPO, including the legal, accounting, printing and other IPO-related costs. Deferred offering costs of $4.8 million are capitalized and classified within restricted cash and other assets on the condensed balance sheet as of June 30, 2019.

Net Loss Per Share Attributable to Common Shareholders

We calculate our basic and diluted net loss per share attributable to common shareholders in conformity with the two-class method required for companies with participating securities. We consider our convertible preferred stock to be participating securities. In the event a dividend is declared or paid on common stock, holders of convertible preferred stock are entitled to a share of such dividend in proportion to the holders of common stock on an as-if converted basis. Under the two-class method, basic net loss per share attributable to common shareholders is calculated by dividing the net loss attributable to common shareholders by the weighted-average number of shares of common stock outstanding for the period. Net loss attributable to common shareholders is determined by allocating undistributed earnings between common and preferred shareholders. The diluted net loss per share attributable to common shareholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period determined using the treasury stock method. The net loss attributable to common shareholders was not allocated to the convertible preferred stock under the two-class method as the convertible preferred stock does not have a contractual obligation to share in our losses. For purposes of this calculation, convertible preferred stock, stock options and warrants to purchase common stock or convertible preferred stock are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common shareholders as their effect is anti-dilutive.

Recently Adopted Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-09, Compensation—Stock Compensation (Topic 718), intended to simplify the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statements of cash flows. This guidance also allowed for an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures as they occur. We adopted this guidance as of January 1, 2018 and elected to account for forfeitures as they occur. We utilized a modified retrospective transition method, recorded the cumulative impact of applying this guidance, and recognized a cumulative increase to additional paid-in capital and an increase to accumulated deficit of $0.1 million.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, intended to simplify the goodwill impairment test. Under the new guidance, goodwill impairment is measured by the amount by which the carrying value of a reporting unit exceeds its fair value, without exceeding the carrying amount of goodwill allocated to that reporting unit. This guidance is effective January 1, 2022 and is required to be adopted on a prospective basis, with early adoption permitted. We adopted this guidance as of January 1, 2018 and the adoption did not have any impact on our financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting, which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. The guidance is effective for us beginning in 2019, with early adoption permitted. We adopted the guidance effective January 1, 2019 and the adoption did not have any impact on our financial statements.

New Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheets and disclosing key information about leasing arrangements. This guidance is effective for us in fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Although we are currently evaluating the impact that adopting this guidance will have on our financial statements, we believe the most significant changes will be related to the recognition of the right-of-use assets and related lease liabilities related to our operating leases on the balance sheets.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which amends the impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables and available-for-sale debt securities. The guidance is effective for us beginning in 2020, with early adoption permitted. Although we are currently evaluating the impact that adopting this guidance prospectively will have on our financial statements, we do not expect the adoption to have a material impact on our financial statements.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other: Internal-Use Software (Subtopic 350-40), to provide additional guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement. This guidance is effective for fiscal years beginning after December 15, 2019 and early adoption of the amendments in this update are permitted. We do not expect the adoption of this guidance to have a material impact on our financial statements.

Revenue

6 Months Ended

Jun. 30, 2019

Revenue From Contract With Customer [Abstract]

Revenue

Translational Development Agreements

On December 18, 2015, we entered into a translational development agreement with a biopharmaceutical customer for access to certain of our oncology immunosequencing research datasets, including full-time employee support, to accelerate the customer’s preclinical, nonclinical and clinical trial testing. Under the initial terms of the agreement we could be entitled to up to $40.0 million over a period of four years which does not include any separately negotiated research sequencing contracts. If the biopharmaceutical customer terminates the agreement prior to the end of the initial four-year research term for any reason other than a material uncured breach by us, then the biopharmaceutical partner has agreed to pay us $0.8 million. In May 2019, the agreement was subsequently amended to reduce the services provided, which in turn reduced the fourth year of eligible payments to $2.3 million.

We identified one performance obligation under this agreement, as the services were determined to be highly interrelated. We determined that any separately negotiated sequencing contracts are not performance obligations under the contract, as the contract did not contain any material rights related to such sequencing contracts. For the identified performance obligation, we assessed the work to be performed over the duration of the contract and determined that it is a consistent level of support throughout the period, and therefore revenue has been recognized straight-line over the contract term.

Revenue recognized from this translational development agreement, excluding separately negotiated research sequencing contracts, was $1.1 million and $2.5 million in the three months ended June 30, 2019 and 2018, respectively, and $1.1 million and $5.0 million in the six months ended June 30, 2019 and 2018, respectively.

In 2017, we entered into an agreement with a customer to provide services to accelerate its research initiatives. We identified one performance obligation under the agreement, as the services were determined to be highly interrelated. We determined that any separately negotiated sequencing contracts are not performance obligations under the contract, as the contract did not contain any material rights related to such sequencing contracts. Revenue recognized from this agreement, excluding sequencing revenue, was $0.1 million and $0.2 million in the three months ended June 30, 2019 and 2018, respectively, and $0.2 million and $0.3 million in the six months ended June 30, 2019 and 2018, respectively.

MRD Development Agreements

In 2017 and 2018, we entered into agreements with biopharmaceutical customers to further develop and commercialize clonoSEQ and the biopharmaceutical customers’ therapeutics. Under each of the agreements, we received or will receive non-refundable upfront payments and could receive substantial additional payments upon reaching certain progress milestones or achievement of certain regulatory milestones pertaining to the customers’ therapeutic and our clonoSEQ test.

Under the contracts, we identify performance obligations, which may include: (i) obligations to provide services supporting the customer’s regulatory submission activities as they relate to our clonoSEQ test; and (ii) sequencing services for customer-provided samples for their regulatory submissions. The transaction price allocated to the respective performance obligations is estimated using an adjusted market assessment approach for the regulatory support services and a standalone selling price for the estimated immunosequencing services. At contract inception we fully constrained any consideration related to the regulatory milestones, as the achievement of such milestones is subject to third-party regulatory approval and the customers’ own submission decision-making. We recognize revenue relating to the sequencing services over time using an output method based on the proportion of sample results delivered relative to the total amount of sample results expected to be delivered and when expected to be a faithful depiction of progress. We use the same method to recognize the regulatory support services. When an output method based on the proportion of sample results delivered is not expected to be a faithful depiction of progress, we utilize an input method based on estimates of effort completed using a cost-based model.

We recognized $0.5 million and $0.6 million in development revenue related to these contracts in the three months ended June 30, 2019 and 2018, respectively, and $0.8 million and $1.9 million in the six months ended June 30, 2019 and 2018, respectively.

As of June 30, 2019, in future periods we could receive up to an additional $115.0 million in milestone payments if certain regulatory approvals are obtained by our customers’ therapeutics in connection with MRD data generated from our clonoSEQ test.

Genentech Collaboration Agreement

In December 2018, we entered into a worldwide collaboration and license agreement (“Genentech Agreement”) with Genentech, Inc. (“Genentech”) to leverage our capability to develop cellular therapies in oncology. Subsequent to receipt of regulatory approval in January 2019, we received a non-refundable upfront payment of $300.0 million in February 2019 and may be eligible to receive more than $1.8 billion over time, including payments of up to $75.0 million upon the achievement of specified regulatory milestones, up to $300.0 million upon the achievement of specified development milestones and up to $1,430.0 million upon the achievement of specified commercial milestones. In addition, we are separately able to receive tiered royalties at a rate ranging from the mid-single digits to the mid-teens on aggregate worldwide net sales of products arising from the strategic collaboration, subject to certain reductions, with aggregate minimum floors. Under the agreement, we are pursuing two product development pathways for novel T cell immunotherapies in which Genentech intends to use T cell receptors (“TCRs”) screened by our immune medicine platform to engineer and manufacture cellular medicines:

•

Shared Products. The shared products will use “off-the-shelf” TCRs identified against cancer antigens shared among patients (“Shared Products”).

•

Personalized Product. The personalized product will use patient-specific TCRs identified by real-time screening of TCRs against cancer antigens in each patient (“Personalized Product”).

Under the terms of the agreement, we granted Genentech exclusive worldwide licenses to develop and commercialize TCR-based cellular therapies in the field of oncology, including licenses to existing shared antigen data packages. Additionally, Genentech has the right to determine which product candidates to further develop for commercialization purposes. We determined that this arrangement meets the criteria set forth in ASC Topic 808, Collaborative Arrangements (“ASC 808”), because both parties are active participants in the activity and are exposed to significant risks and rewards depending on the activity’s commercial failure or success. Because ASC 808 does not provide guidance on how to account for the activities under a collaborative arrangement, we applied the guidance in ASC 606 to account for the activities related to the Genentech collaboration.

In applying ASC 606, we identified the following performance obligations at the inception of the agreement:

License to utilize on an exclusive basis all TCR-specific platform intellectual property to develop and commercialize any licensed products in the field of oncology.

License to utilize all data and information within each shared antigen data package and any other know-how disclosed by us to Genentech in oncology.

License to utilize all private antigen TCR product data in connection with research and development activities in the field of use.

License to existing shared antigen data packages.

Research and development services for shared product development including expansion of shared antigen data packages.

Research and development services for private product development.

Obligations to participate on various joint research, development and project committees.

We determined that none of the licenses, research and development services or obligations to participate on various committees were distinct within the context of the contract given such rights and activities were highly interrelated and there was substantial additional research and development to further develop the licenses. We considered factors such as the stage of development of the respective existing antigen data packages, the subsequent development that would be required to both identify and submit a potential target for investigational new drug acceptance under both product pathways and the variability in research and development pathways given Genentech’s control of product commercialization. Specifically, under the agreement, Genentech is not required to pursue development or commercialization activities pertaining to both product pathways and may choose to proceed with one or the other as opposed to both. Accordingly, we determined that all of the identified performance obligations were attributable to one general performance obligation, which is to further the development of our TCR-specific platform, including data packages, and continue to make our TCR identification process available to Genentech to pursue either product pathway.

Separately, we have a responsibility to Genentech to enter into a supply and manufacturing agreement for patient specific TCRs as it pertains to any Personalized Product therapeutic. We determined this was an option right of Genentech should they pursue commercialization of a Personalized Product therapy. Because of the uncertainty as a result of the early stage of development, the novel approach of our collaboration with Genentech and our rights to future commercial milestones and royalty payments, we determined that this option right was not a material right that should be accounted for at inception. As such, we will account for the supply and manufacturing agreement when entered into between the parties.

We determined the initial transaction price shall be made up of only the $300.0 million upfront, non-refundable payment as all potential regulatory and development milestone payments were probable of significant revenue reversal as their achievement was highly dependent on factors outside our control. As a result, these payments were fully constrained and were not included in the transaction price as of June 30, 2019. We excluded the commercial milestones and potential royalties from the transaction price as those items relate predominantly to the license rights granted to Genentech and will be assessed when and if such events occur.

As there are potential substantive developments necessary, which Genentech may be able to direct, we determined that we would apply a proportional performance model to recognize revenue for our performance obligation. We measure proportional performance using an input method based on costs incurred relative to the total estimated costs of research and development efforts to pursue both the Shared Product and Personalized Product pathways. We currently expect to recognize the revenue over a period of approximately seven to eight years from the effective date. This estimate of the research and development period considers pursuit options of development activities supporting both the Shared Product and the Personalized Product, but may be reduced or increased based on the various activities as directed by the joint committees, decisions made by Genentech, regulatory feedback or other factors not currently known.

We recognized revenue of approximately $8.5 million and $14.8 million for the three and six months ended June 30, 2019, respectively, related to the Genentech collaboration. Costs related to the Genentech collaboration are included in research and development expenses.

Fair Value Measurements

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

4.	Fair Value Measurements

The following table sets forth the fair value of financial assets and liabilities that were measured at fair value on a recurring basis (in thousands):

	June 30, 2019
	Level 1		Level 2		Level 3		Total
	(unaudited)
Financial assets
Money market funds	$	35,695	$	—	$	—	$	35,695
Commercial paper		—		88,161		—		88,161
U.S. government debt and agency securities		—		273,713		—		273,713
Corporate bonds		—		22,661		—		22,661
Total financial assets	$	35,695	$	384,535	$	—	$	420,230
Financial liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	2,602	$	2,602
Total financial liabilities	$	—	$	—	$	2,602	$	2,602

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets
Money market funds	$	45,998	$	—	$	—	$	45,998
Commercial paper		—		16,887		—		16,887
U.S. government debt and agency securities		—		85,623		—		85,623
Corporate bonds		—		7,478		—		7,478
Total financial assets	$	45,998	$	109,988	$	—	$	155,986
Financial liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	336	$	336
Total financial liabilities	$	—	$	—	$	336	$	336

Level 1 securities include highly liquid money market funds, which we measure the fair value based on quoted prices in active markets for identical assets or liabilities. Level 2 securities consist of U.S. government debt securities, U.S. government agency bonds, commercial paper and corporate bonds, and are valued based on recent trades of securities in inactive markets or based on quoted market prices of similar instruments and other significant inputs derived from or corroborated by observable market data. Of the Level 2 commercial paper and U.S. government debt and agency securities balances, $6.0 million and $4.0 million, respectively, is recorded as cash and cash equivalents. Level 3 liabilities that are measured at fair value on a recurring basis consist of a convertible preferred stock warrant liability. During the six months ended June 30, 2019, we recognized $2.3 million of expense related to the revaluation of the convertible preferred stock warrant liability in interest and other income, net.

The fair value of the convertible preferred stock warrant liability is estimated using the Black-Scholes option-pricing model. Certain inputs were utilized in the option-pricing model as follows:

	June 30, 2019			December 31, 2018
	(unaudited)
Fair value estimate	$	48.30		$	8.27
Expected term (in years)		1.81			2.31
Risk-free interest rate		1.8	%		2.5	%
Expected volatility		61.1	%		55.3	%
Expected dividend yield		—			—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Investments

6 Months Ended

Jun. 30, 2019

Investments Debt And Equity Securities [Abstract]

Investments

5.	Investments

Available-for-sale investments consisted of the following as of June 30, 2019 and December 31, 2018 (in thousands):

	June 30, 2019
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
	(unaudited)
Short-term marketable securities
Commercial paper	$	82,165	$	—	$	—		$	82,165
U.S. government debt and agency securities		269,366		351		(1	)		269,716
Corporate bonds		22,630		32		—			22,662
Total short-term marketable securities	$	374,161	$	383	$	(1	)	$	374,543

	December 31, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Short-term marketable securities
Commercial paper	$	16,887	$	—	$	—		$	16,887
U.S. government debt and agency securities		85,722		—		(99	)		85,623
Corporate bonds		7,486		—		(8	)		7,478
Total short-term marketable securities	$	110,095	$	—	$	(107	)	$	109,988

The following table presents the gross unrealized holding losses and fair value for investments in an unrealized loss position, and the length of time that individual securities have been in a continuous loss position, as of June 30, 2019 (in thousands):

	Less Than 12 Months				12 Months Or Greater
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
	(unaudited)
Short-term marketable securities
U.S. government debt and agency securities	$	—	$	—	$	4,997	$	(1	)
Total short-term marketable securities	$	—	$	—	$	4,997	$	(1	)

We evaluated our securities for other-than-temporary impairment and considered the decline in market value for the securities to be primarily attributable to current economic and market conditions. It is not more likely than not that we will be required to sell the securities, and we do not intend to do so prior to the recovery of the amortized cost basis. Based on this analysis, these marketable securities were not considered to be other-than-temporarily impaired as of June 30, 2019.

All the corporate debt, U.S. government and agency securities and commercial paper have an effective maturity date of less than one year.

Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

6.	Goodwill and Intangible Assets

There have been no changes in the carrying amount of goodwill since its recognition in 2015.

Intangible assets subject to amortization as of the dates presented consisted of the following (in thousands):

	June 30, 2019
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(unaudited)
Acquired developed technology	$	20,000	$	(7,462	)	$	12,538
Purchased intellectual property		325		(79	)		246
Balance at June 30, 2019	$	20,325	$	(7,541	)	$	12,784

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Acquired developed technology	$	20,000	$	(6,636	)	$	13,364
Purchased intellectual property		325		(63	)		262
Balance at December 31, 2018	$	20,325	$	(6,699	)	$	13,626

The developed technology was acquired in connection with our acquisition of Sequenta, Inc. (“Sequenta”) in 2015. The remaining balance of the acquired technology and the purchased intellectual property is expected to be amortized over the next approximately 7.5 years.

As of June 30, 2019, expected future amortization expense for intangible assets was as follows (in thousands) (unaudited):

2019	$	856
2020		1,698
2021		1,698
2022		1,698
2023		1,698
Thereafter		5,136
Total future amortization expense	$	12,784

Deferred Revenue

6 Months Ended

Jun. 30, 2019

Revenue From Contract With Customer [Abstract]

Deferred Revenue

7.	Deferred Revenue

Deferred revenue by revenue classification was as follows (in thousands):

	June 30, 2019		December 31, 2018
	(unaudited)
Current deferred revenue
Sequencing	$	14,616	$	11,238
Development		46,578		1,457
Total current deferred revenue		61,194		12,695
Non-current deferred revenue
Sequencing		493		516
Development		240,426		188
Total non-current deferred revenue		240,919		704
Total current and non-current deferred revenue	$	302,113	$	13,399

Genentech deferred revenue represents $45.0 million and $240.2 million of the current and non-current development deferred revenue balances, respectively, at June 30, 2019. In general, the current amounts will be recognized as revenue within 12 months and the long-term amounts will be recognized as revenue over a period of approximately seven to eight years. This period of time represents an estimate of the research and development period to develop cellular therapies in oncology, which may be reduced or increased based on the various development activities.

Changes in deferred revenue during the six months ended June 30, 2019 were as follows (in thousands):

Deferred revenue balance at December 31, 2018	$	13,399
Additions to deferred revenue during the period (unaudited)		308,055
Revenue recognized during the period (unaudited)		(19,341	)
Deferred revenue balance at June 30, 2019 (unaudited)	$	302,113

As of June 30, 2019, $4.4 million was recognized that was included in the deferred revenue balance at December 31, 2018. As a result of cancelled customer sequencing contracts, we recognized $0.8 million of sequencing revenue during the six months ended June 30, 2019.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

8.	Commitments and Contingencies

Operating Leases

We have entered into various non-cancelable lease agreements for our office and laboratory spaces.

In July 2011, we entered into a non-cancelable lease agreement with a minority shareholder for laboratory and office space in Seattle, Washington. The lease terms were subsequently amended multiple times, most recently in June 2016. The lease terminates in June 2023. The lease also requires us to pay additional amounts for operating and maintenance expenses.

In October 2016, we entered into an agreement to sublease certain laboratory and office space in South San Francisco, California. The lease commenced in October 2016 and terminated in March 2019. The lease required us to pay additional amounts for operating and maintenance expenses.

In April 2018, we entered into a lease agreement to lease additional space in South San Francisco, California. The lease term is through March 2026 and provides for one five-year option. We will be responsible for our share of allocable operating expenses, tax expenses and utilities cost during the duration of the lease term. In connection with the lease, the landlord funded agreed-upon improvements prior to the lease commencement date of December 12, 2018. The landlord was solely responsible for the $2.4 million cost of such improvements, which we recognized as a leasehold improvement asset that depreciates beginning from the commencement date to the initial lease term, and a corresponding leasehold incentive obligation, which is amortized over the life of the lease.

As of June 30, 2019, future minimum lease payments, exclusive of operating and maintenance costs, were as follows (in thousands) (unaudited):

2019	$	1,781
2020		3,819
2021		3,917
2022		4,017
2023		2,295
Thereafter		2,315
Total future minimum lease payments	$	18,144

Rent expenses, inclusive of operating and maintenance costs, were $1.1 million and $0.9 million for the three months ended June 30, 2019 and 2018, respectively, and $2.3 million and $1.8 million for the six months ended June 30, 2019 and 2018, respectively.

Legal Proceedings

We are subject to claims and assessments from time to time in the ordinary course of business. We will accrue a liability for such matters when it is probable that a liability has been incurred and the amount can be reasonably estimated. When only a range of possible loss can be established, the most probable amount in the range is accrued. If no amount within this range is a better estimate than any other amount within the range, the minimum amount in the range is accrued. We are not currently party to any material legal proceedings.

Indemnification Agreements

In the ordinary course of business, we may provide indemnification of varying scope and terms to vendors, lessors, customers and other parties with respect to certain matters including, but not limited to, losses arising out of breach of our agreements with them or from intellectual property infringement claims made by third parties. In addition, we have entered into indemnification agreements with members of our Board of Directors and certain of our executive officers that will require us to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The maximum potential amount of future payments that we could be required to make under these indemnification agreements is, in many cases, unlimited. We have not incurred any material costs as a result of such indemnifications and are not currently aware of any indemnification claims.

Convertible Preferred Stock

6 Months Ended

Jun. 30, 2019

Temporary Equity Disclosure [Abstract]

Convertible Preferred Stock

9.	Convertible Preferred Stock

Convertible preferred stock at June 30, 2019 consisted of the following (in thousands, except share data) (unaudited):

	Shares Authorized		Shares Issued and Outstanding		Amount			Liquidation Preference
Series A		4,550,000		4,550,000	$	12,405		$	4,550
Series B		5,645,706		5,645,706		16,018			9,669
Series C		4,804,227		4,747,352		14,425			12,521
Series D		19,269,117		19,269,117		106,905			106,999
Series E		15,524,350		15,524,350		93,698			93,750
Series E-1		17,407,441		16,854,887		73,640	⁽¹⁾		101,785
Series F		21,761,676		21,761,676		195,013			195,100
Series F-1		4,800,000		4,686,649		49,827			50,000
Total convertible preferred stock		93,762,517		93,039,737	$	561,931		$	574,374

(1) Includes vested Series E-1 convertible preferred stock options of $0.7 million which are not included in the shares issued and outstanding.

Shareholders’ Deficit

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Shareholders’ Deficit

10.	Shareholders’ Deficit

Common Stock

We are authorized to issue 131,000,000 shares of common stock. Our common stock has a par value of $0.0001, no preferences or privileges and is not redeemable. Holders of our common stock are entitled to one vote for each share of common stock held.

We have reserved shares of common stock for the following as of June 30, 2019 (unaudited):

Shares to be issued upon conversion of all series of convertible preferred stock			93,039,737
Shares to be issued upon exercise of outstanding common stock options			17,681,436
Shares available for future stock option grants			3,155,968
Shares to be issued upon exercise of outstanding Series E-1 convertible preferred stock options			15,034
Shares to be issued upon conversion of Series C convertible preferred stock in connection with warrant exercise			56,875
Shares to be issued upon conversion of common stock warrants			55,032
Shares of common stock reserved for future issuance			114,004,082

Common Stock Warrants

In connection with two transactions in 2012 and 2013, we granted warrants to purchase up to 55,032 shares of common stock. The warrants are exercisable at any time for a period of ten years from the date of issuance at a weighted-average exercise price of $0.37, except in the case of a warrant to purchase 20,000 shares of common stock at an exercise price of $0.45 per share that would have expired if unexercised prior to the closing of our IPO.

Equity Incentive Plans

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Equity Incentive Plans

11.	Equity Incentive Plans

Adaptive 2009 Equity Incentive Plan

We adopted an equity incentive plan in 2009 (“2009 Plan”) that provides for the issuance of incentive and nonqualified common stock options, and other share-based awards for employees, directors and consultants. Under the 2009 Plan, the option exercise price for incentive and nonqualified stock options may not be less than the fair market value of our common stock at the date of grant as determined by our Board of Directors. Options expire no later than ten years from the grant date, and vesting is established at the time of grant. As of June 30, 2019, we have 20,837,404 shares of common stock available for issuance under the 2009 Plan.

A summary of our option activity during the six months ended June 30, 2019 is as follows:

	Shares Available for Grant			Shares Subject to Outstanding Options			Weighted- Average Exercise Price per Share		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018		6,827,996			14,893,253		$	4.59	$	39,864
Options granted (unaudited)		(3,890,331	)		3,890,331			7.55
Forfeited or cancelled (unaudited)		218,303			(218,303	)		6.19
Exercised (unaudited)		—			(883,845	)		2.13
Outstanding at June 30, 2019 (unaudited)		3,155,968			17,681,436			5.35		759,479

Sequenta 2008 Stock Plan, as amended

In connection with our acquisition of Sequenta in January 2015, we assumed Sequenta’s Equity Incentive Plan (“2008 Plan”), including all outstanding options and shares available for future issuance under the 2008 Plan, which are all exercisable for Series E-1 convertible preferred stock.

A summary of our Series E-1 convertible preferred stock option activity during the six months ended June 30, 2019 is as follows:

	Convertible Preferred Shares Subject to Outstanding Options			Weighted- Average Exercise Price per Share		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018		264,677		$	0.44	$	1,826
Options granted (unaudited)		—			—
Forfeited or cancelled (unaudited)		—			—
Exercised (unaudited)		(249,643	)		0.44
Outstanding at June 30, 2019 (unaudited)		15,034			0.49		719

Fair Value of Options Granted

The estimated fair value of options granted during the six months ended June 30, 2019 and 2018 was estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions for our 2009 Plan:

	Adaptive 2009 Equity Incentive Plan
	Six Months Ended June 30,
	2019			2018
	(unaudited)
Grant date fair value	$	8.55		$	6.55
Expected term (in years)		6.06			6.16
Risk-free interest rate		2.4	%		2.7	%
Expected volatility		67.9	%		69.2	%
Expected dividend yield		—			—

The determination of the fair value of stock options on the date of grant using a Black-Scholes option-pricing model is affected by the estimated fair value of our common stock, as well as assumptions regarding a number of variables that are complex, subjective and generally require significant judgment to determine. The valuation assumptions were determined as follows:

Fair value of common stock—The grant date fair value of our common stock has been determined by our Board of Directors with input from management. The grant date fair value of the common stock was determined using valuation methodologies which utilize certain assumptions, including probability weighting of events, volatility, time to liquidation, a risk-free interest rate and an assumption for a discount for lack of marketability (Level 3 inputs). In determining the fair value of the common stock, the methodologies used to estimate the enterprise value were performed using methodologies, approaches and assumptions consistent with the American Institute of Certified Public Accountants Accounting and Valuation Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation. For valuations after the closing of our IPO, our board of directors plans to determine the fair value of each share of common stock based on the closing price of our common stock on the date of grant or other relevant determination date, as reported on The Nasdaq Global Select Market.

Expected term—The expected life of options granted to employees is determined using the “simplified” method, as illustrated in ASC Topic 718, Compensation—Stock Compensation, as we do not have sufficient exercise history to determine a better estimate of expected term. Under this approach, the expected term is presumed to be the average of the weighted-average vesting term and the contractual term of the option.

Risk-free interest rate—We utilize a risk-free interest rate in the option valuation model based on U.S. Treasury zero-coupon issues, with remaining terms similar to the expected term of the options.

Expected volatility—As we do not have sufficient trading history for our common stock, the expected volatility is based on the historical volatility of our publicly traded industry peers utilizing a period of time consistent with our estimate of the expected term.

Expected dividend yield—We do not anticipate paying any cash dividends in the foreseeable future and, therefore, use an expected dividend yield of zero in the option valuation model.

Share-based compensation expense of $3.3 million and $2.4 million was recognized during the three months ended June 30, 2019 and 2018, respectively, and $6.4 million and $5.6 million was recognized during the six months ended June 30, 2019 and 2018, respectively. The compensation costs related to stock options are included in our unaudited condensed statements of operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(unaudited)
Cost of revenue	$	113	$	92	$	243	$	176
Research and development		978		652		1,895		1,468
Sales and marketing		943		592		1,849		1,549
General and administration		1,298		1,112		2,391		2,357
Total share-based compensation expense	$	3,332	$	2,448	$	6,378	$	5,550

At June 30, 2019, unrecognized share-based compensation expense related to unvested stock options was $33.2 million, which is expected to be recognized over a remaining weighted-average period of 3.16 years.

Net Loss Per Share Attributable to Common Shareholders

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Net Loss Per Share Attributable to Common Shareholders

12.	Net Loss Per Share Attributable to Common Shareholders

Net Loss Per Share

The following table sets forth the computation of the basic and diluted net loss per share attributable to common shareholders (in thousands, except shares and per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(unaudited)
Net loss	$	(15,659	)	$	(12,493	)	$	(34,045	)	$	(24,884	)
Fair value adjustments to redemption value for Series E-1 convertible preferred stock options		(710	)		(2	)		(964	)		2
Net loss attributable to common shareholders, basic and diluted	$	(16,369	)	$	(12,495	)	$	(35,009	)	$	(24,882	)
Weighted-average shares used in computing net loss per share		13,279,324			12,385,888			13,074,692			12,334,227
Net loss per share attributable to common shareholders, basic and diluted	$	(1.23	)	$	(1.01	)	$	(2.68	)	$	(2.02	)

Since we were in a loss position for all periods presented, basic net loss per share attributable to common shareholders is the same as diluted net loss per share attributable to common shareholders, as the inclusion of all potential shares of common stock outstanding would have been anti-dilutive. The following weighted-average common stock equivalents were excluded from the calculation of diluted net loss per share attributable to common shareholders for the periods presented, as they had an anti-dilutive effect:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(unaudited)
Convertible preferred stock (on as if converted basis)		93,028,311		92,768,158		92,973,101		92,751,261
2009 Plan stock options issued and outstanding		17,591,720		14,597,833		16,826,833		13,927,507
2008 Plan stock options issued and outstanding		26,460		364,625		81,670		403,591
Common stock warrants		55,032		55,032		55,032		55,032
Convertible preferred stock warrants		56,875		56,875		56,875		56,875
Total		110,758,398		107,842,523		109,993,511		107,194,266

Subsequent Events

6 Months Ended

Jun. 30, 2019

Subsequent Events [Abstract]

Subsequent Events

13.	Subsequent Events

On July 1, 2019, we completed our IPO. For details regarding this event, including the automatic conversion of all shares of our convertible preferred stock into common stock, our amended and restated articles of incorporation and bylaws and our 2019 Plan, please refer to Note 1 – Organization and Description of Business – Initial Public Offering.

In August 2019, we entered into an operating lease to rent 100,000 square feet in a to-be-constructed building in Seattle, Washington. Shell construction is expected to be completed in 2020. The lease term commences on the date that the landlord delivers the premises to us for construction of certain tenant improvements. Rent obligations commence 10 months thereafter, and the lease term ends 142 months form the date rent commences, subject to our option to twice extend the lease for five years. The lease is cancellable under certain circumstances if the landlord fails to deliver the premises to us by May 1, 2021. We plan to occupy the new building in 2021, once interior construction is finished. The lease also requires us to pay additional amounts for operating and maintenance expenses. In connection with the new lease, we also entered into a letter of credit of $2.1 million with one of our existing financial institutions.

Furthermore, in August 2019, we amended the lease for our current headquarters in Seattle, Washington to expand the size of the existing premises by approximately 8,400 square feet. Rent obligations of the expanded premises commence four months after the landlord delivers the premises to us for construction of certain tenant improvements, and the lease term for both the existing premises and the expanded premises ends 142 months after the commencement date of the new lease mentioned above, subject to our option to twice extend the lease for five years. If the new lease does not commence, the lease term for the existing premises and the expanded premises ends March 31, 2024.

Expected future minimum payments for the leased spaces, exclusive of operating and maintenance costs and assuming attainment of our target commencement dates, are as follows (in thousands) (unaudited):

2019	$	1,431
2020		3,053
2021		5,802
2022		9,706
2023		9,975
Thereafter		105,270
Total future minimum lease payments	$	135,237

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation and Use of Estimates

Unaudited Interim Condensed Financial Statements

Cash and Cash Equivalents

Concentrations of Risk

For each significant customer, revenue as a percentage of total revenue and accounts receivable, net as a percentage of total accounts receivable, net were as follows:

Revenue

Accounts Receivable, Net

Three Months Ended June 30,

Six Months Ended

June 30,

December 31,

2019

2018

2019

2018

2019

2018

(unaudited)

Customer A

12.7%

25.5%

26.4%

32.7%

Customer B

11.0

15.1

Customer C

13.2

Genentech, Inc.

40.0

43.6

* less than 10%

Revenue Recognition

Overview

Sequencing Revenue

research service contracts: sequencing services and related data analysis. We recognize revenue for both identified performance obligations as sample results are delivered to the customer.

Development Revenue

Deferred Offering Costs

Net Loss Per Share Attributable to Common Shareholders

Recently Adopted Accounting Pronouncements

New Accounting Pronouncements Not Yet Adopted

Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of Concentrations of Risk Percentage

For each significant customer, revenue as a percentage of total revenue and accounts receivable, net as a percentage of total accounts receivable, net were as follows:

Revenue

Accounts Receivable, Net

Three Months Ended June 30,

Six Months Ended

June 30,

December 31,

2019

2018

2019

2018

2019

2018

(unaudited)

Customer A

12.7%

25.5%

26.4%

32.7%

Customer B

11.0

15.1

Customer C

13.2

Genentech, Inc.

40.0

43.6

* less than 10%

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table sets forth the fair value of financial assets and liabilities that were measured at fair value on a recurring basis (in thousands):

	June 30, 2019
	Level 1		Level 2		Level 3		Total
	(unaudited)
Financial assets
Money market funds	$	35,695	$	—	$	—	$	35,695
Commercial paper		—		88,161		—		88,161
U.S. government debt and agency securities		—		273,713		—		273,713
Corporate bonds		—		22,661		—		22,661
Total financial assets	$	35,695	$	384,535	$	—	$	420,230
Financial liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	2,602	$	2,602
Total financial liabilities	$	—	$	—	$	2,602	$	2,602

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets
Money market funds	$	45,998	$	—	$	—	$	45,998
Commercial paper		—		16,887		—		16,887
U.S. government debt and agency securities		—		85,623		—		85,623
Corporate bonds		—		7,478		—		7,478
Total financial assets	$	45,998	$	109,988	$	—	$	155,986
Financial liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	336	$	336
Total financial liabilities	$	—	$	—	$	336	$	336

Summary of Fair Value of Convertible Preferred Stock Warrant Liability Estimated Using Black-Scholes Option Pricing Model

The fair value of the convertible preferred stock warrant liability is estimated using the Black-Scholes option-pricing model. Certain inputs were utilized in the option-pricing model as follows:

	June 30, 2019			December 31, 2018
	(unaudited)
Fair value estimate	$	48.30		$	8.27
Expected term (in years)		1.81			2.31
Risk-free interest rate		1.8	%		2.5	%
Expected volatility		61.1	%		55.3	%
Expected dividend yield		—			—

Investments (Tables)

6 Months Ended

Jun. 30, 2019

Investments Debt And Equity Securities [Abstract]

Schedule of Available-for-sale Investments

Available-for-sale investments consisted of the following as of June 30, 2019 and December 31, 2018 (in thousands):

	June 30, 2019
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
	(unaudited)
Short-term marketable securities
Commercial paper	$	82,165	$	—	$	—		$	82,165
U.S. government debt and agency securities		269,366		351		(1	)		269,716
Corporate bonds		22,630		32		—			22,662
Total short-term marketable securities	$	374,161	$	383	$	(1	)	$	374,543

	December 31, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Short-term marketable securities
Commercial paper	$	16,887	$	—	$	—		$	16,887
U.S. government debt and agency securities		85,722		—		(99	)		85,623
Corporate bonds		7,486		—		(8	)		7,478
Total short-term marketable securities	$	110,095	$	—	$	(107	)	$	109,988

Schedule of Gross Unrealized Holding Losses and Fair Value for Investments in Unrealized Loss Position

	Less Than 12 Months				12 Months Or Greater
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
	(unaudited)
Short-term marketable securities
U.S. government debt and agency securities	$	—	$	—	$	4,997	$	(1	)
Total short-term marketable securities	$	—	$	—	$	4,997	$	(1	)

Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets Subject to Amortization

Intangible assets subject to amortization as of the dates presented consisted of the following (in thousands):

	June 30, 2019
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(unaudited)
Acquired developed technology	$	20,000	$	(7,462	)	$	12,538
Purchased intellectual property		325		(79	)		246
Balance at June 30, 2019	$	20,325	$	(7,541	)	$	12,784

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Acquired developed technology	$	20,000	$	(6,636	)	$	13,364
Purchased intellectual property		325		(63	)		262
Balance at December 31, 2018	$	20,325	$	(6,699	)	$	13,626

Schedule of Future Amortization Expense for Intangible Assets

As of June 30, 2019, expected future amortization expense for intangible assets was as follows (in thousands) (unaudited):

2019	$	856
2020		1,698
2021		1,698
2022		1,698
2023		1,698
Thereafter		5,136
Total future amortization expense	$	12,784

Deferred Revenue (Tables)

6 Months Ended

Jun. 30, 2019

Revenue From Contract With Customer [Abstract]

Deferred Revenue by Revenue Classification

Deferred revenue by revenue classification was as follows (in thousands):

	June 30, 2019		December 31, 2018
	(unaudited)
Current deferred revenue
Sequencing	$	14,616	$	11,238
Development		46,578		1,457
Total current deferred revenue		61,194		12,695
Non-current deferred revenue
Sequencing		493		516
Development		240,426		188
Total non-current deferred revenue		240,919		704
Total current and non-current deferred revenue	$	302,113	$	13,399

Changes in Deferred Revenue

Changes in deferred revenue during the six months ended June 30, 2019 were as follows (in thousands):

Deferred revenue balance at December 31, 2018	$	13,399
Additions to deferred revenue during the period (unaudited)		308,055
Revenue recognized during the period (unaudited)		(19,341	)
Deferred revenue balance at June 30, 2019 (unaudited)	$	302,113

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

As of June 30, 2019, future minimum lease payments, exclusive of operating and maintenance costs, were as follows (in thousands) (unaudited):

2019	$	1,781
2020		3,819
2021		3,917
2022		4,017
2023		2,295
Thereafter		2,315
Total future minimum lease payments	$	18,144

2019	$	1,431
2020		3,053
2021		5,802
2022		9,706
2023		9,975
Thereafter		105,270
Total future minimum lease payments	$	135,237

Convertible Preferred Stock (Tables)

6 Months Ended

Jun. 30, 2019

Temporary Equity Disclosure [Abstract]

Schedule of Convertible Preferred Stock

Convertible preferred stock at June 30, 2019 consisted of the following (in thousands, except share data) (unaudited):

	Shares Authorized		Shares Issued and Outstanding		Amount			Liquidation Preference
Series A		4,550,000		4,550,000	$	12,405		$	4,550
Series B		5,645,706		5,645,706		16,018			9,669
Series C		4,804,227		4,747,352		14,425			12,521
Series D		19,269,117		19,269,117		106,905			106,999
Series E		15,524,350		15,524,350		93,698			93,750
Series E-1		17,407,441		16,854,887		73,640	⁽¹⁾		101,785
Series F		21,761,676		21,761,676		195,013			195,100
Series F-1		4,800,000		4,686,649		49,827			50,000
Total convertible preferred stock		93,762,517		93,039,737	$	561,931		$	574,374

(1) Includes vested Series E-1 convertible preferred stock options of $0.7 million which are not included in the shares issued and outstanding.

Shareholders’ Deficit (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Summary of Reserved Shares of Common Stock

We have reserved shares of common stock for the following as of June 30, 2019 (unaudited):

Shares to be issued upon conversion of all series of convertible preferred stock			93,039,737
Shares to be issued upon exercise of outstanding common stock options			17,681,436
Shares available for future stock option grants			3,155,968
Shares to be issued upon exercise of outstanding Series E-1 convertible preferred stock options			15,034
Shares to be issued upon conversion of Series C convertible preferred stock in connection with warrant exercise			56,875
Shares to be issued upon conversion of common stock warrants			55,032
Shares of common stock reserved for future issuance			114,004,082

Equity Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2019

Summary of Estimated Fair Value of Options Granted

	Adaptive 2009 Equity Incentive Plan
	Six Months Ended June 30,
	2019			2018
	(unaudited)
Grant date fair value	$	8.55		$	6.55
Expected term (in years)		6.06			6.16
Risk-free interest rate		2.4	%		2.7	%
Expected volatility		67.9	%		69.2	%
Expected dividend yield		—			—

Summary of Compensation Costs Related to Stock Options Included in Statements of Operations

The compensation costs related to stock options are included in our unaudited condensed statements of operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(unaudited)
Cost of revenue	$	113	$	92	$	243	$	176
Research and development		978		652		1,895		1,468
Sales and marketing		943		592		1,849		1,549
General and administration		1,298		1,112		2,391		2,357
Total share-based compensation expense	$	3,332	$	2,448	$	6,378	$	5,550

2009 Equity Incentive Plan

Summary of Option Activity

A summary of our option activity during the six months ended June 30, 2019 is as follows:

	Shares Available for Grant			Shares Subject to Outstanding Options			Weighted- Average Exercise Price per Share		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018		6,827,996			14,893,253		$	4.59	$	39,864
Options granted (unaudited)		(3,890,331	)		3,890,331			7.55
Forfeited or cancelled (unaudited)		218,303			(218,303	)		6.19
Exercised (unaudited)		—			(883,845	)		2.13
Outstanding at June 30, 2019 (unaudited)		3,155,968			17,681,436			5.35		759,479

Sequenta, Inc. 2008 Stock Plan | Series E-1 Convertible Preferred Stock

Summary of Option Activity

A summary of our Series E-1 convertible preferred stock option activity during the six months ended June 30, 2019 is as follows:

	Convertible Preferred Shares Subject to Outstanding Options			Weighted- Average Exercise Price per Share		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018		264,677		$	0.44	$	1,826
Options granted (unaudited)		—			—
Forfeited or cancelled (unaudited)		—			—
Exercised (unaudited)		(249,643	)		0.44
Outstanding at June 30, 2019 (unaudited)		15,034			0.49		719

Net Loss Per Share Attributable to Common Shareholders (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Computation of the Basic and Diluted Net Loss Per Share Attributable to Common Shareholders

The following table sets forth the computation of the basic and diluted net loss per share attributable to common shareholders (in thousands, except shares and per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(unaudited)
Net loss	$	(15,659	)	$	(12,493	)	$	(34,045	)	$	(24,884	)
Fair value adjustments to redemption value for Series E-1 convertible preferred stock options		(710	)		(2	)		(964	)		2
Net loss attributable to common shareholders, basic and diluted	$	(16,369	)	$	(12,495	)	$	(35,009	)	$	(24,882	)
Weighted-average shares used in computing net loss per share		13,279,324			12,385,888			13,074,692			12,334,227
Net loss per share attributable to common shareholders, basic and diluted	$	(1.23	)	$	(1.01	)	$	(2.68	)	$	(2.02	)

Weighted-Average Common Stock Equivalents were Excluded From Calculation of Diluted Net Loss Per Share Attributable to Common Shareholders

The following weighted-average common stock equivalents were excluded from the calculation of diluted net loss per share attributable to common shareholders for the periods presented, as they had an anti-dilutive effect:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(unaudited)
Convertible preferred stock (on as if converted basis)		93,028,311		92,768,158		92,973,101		92,751,261
2009 Plan stock options issued and outstanding		17,591,720		14,597,833		16,826,833		13,927,507
2008 Plan stock options issued and outstanding		26,460		364,625		81,670		403,591
Common stock warrants		55,032		55,032		55,032		55,032
Convertible preferred stock warrants		56,875		56,875		56,875		56,875
Total		110,758,398		107,842,523		109,993,511		107,194,266

Subsequent Events (Tables)

6 Months Ended

Jun. 30, 2019

Subsequent Events [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

As of June 30, 2019, future minimum lease payments, exclusive of operating and maintenance costs, were as follows (in thousands) (unaudited):

2019	$	1,781
2020		3,819
2021		3,917
2022		4,017
2023		2,295
Thereafter		2,315
Total future minimum lease payments	$	18,144

2019	$	1,431
2020		3,053
2021		5,802
2022		9,706
2023		9,975
Thereafter		105,270
Total future minimum lease payments	$	135,237

Organization and Description of Business - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 01, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Subsidiary Or Equity Method Investee [Line Items]
Convertible preferred stock outstanding		93,039,737		92,790,094
Initial share reserve		114,004,082
Convertible Preferred Stock
Subsidiary Or Equity Method Investee [Line Items]
Convertible preferred stock outstanding		93,039,737	93,023,694	92,790,094	92,790,094	92,745,734	92,656,029
Initial share reserve		93,039,737
Subsequent Event \| 2019 Plan
Subsidiary Or Equity Method Investee [Line Items]
Initial share reserve	15,519,170
Initial Public Offering \| Subsequent Event
Subsidiary Or Equity Method Investee [Line Items]
Shares issued	17,250,000
Public offering price	$ 20.00
Net proceeds	$ 316.0
Underwriting discounts, commissions and other costs	24.2
Offering expenses	$ 4.8

Significant Accounting Policies - Schedule of Concentrations of Risk Percentage (Details) - Customer Concentration Risk	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Customer A \| Revenue
Significant Accounting Policies [Line Items]
Concentration risk, percentage	12.70%	25.50%		26.40%
Customer A \| Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Concentration risk, percentage			32.70%
Customer B \| Revenue
Significant Accounting Policies [Line Items]
Concentration risk, percentage		11.00%
Customer B \| Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Concentration risk, percentage					15.10%
Customer C \| Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Concentration risk, percentage					13.20%
Genentech, Inc. \| Revenue
Significant Accounting Policies [Line Items]
Concentration risk, percentage	40.00%		43.60%

Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) Performance_Obligation
Accounting Standards Update 2016-09
Significant Accounting Policies [Line Items]
Cumulative impact to accumulated deficit		$ 0.1
Restricted Cash and Other Assets
Significant Accounting Policies [Line Items]
Deferred offering costs	$ 4.8	$ 4.8
Sequencing Revenue
Significant Accounting Policies [Line Items]
Number of revenue performance obligations \| Performance_Obligation		2
Sequencing Revenue From Coverage Policy
Significant Accounting Policies [Line Items]
Revenue recognized	0.3	$ 0.8
Sequencing Revenue From Test Deliver
Significant Accounting Policies [Line Items]
Revenue recognized	$ 0.1	$ 0.4

Revenue - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended
Revenue - Additional Information (Details) - USD ($)	Jun. 30, 2019	Dec. 18, 2015	Feb. 28, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenue recognized	$ 4,400,000					$ 19,341,000
Revenue from collaboration agreement				$ 22,138,000	$ 11,568,000	34,804,000	$ 21,283,000
Translational Development Agreements
Disaggregation Of Revenue [Line Items]
Term of agreement		4 years
Agreement termination amount receivable		$ 800,000
Eligible payments receivable		2,300,000
Revenue recognized excluding separately negotiated research sequencing contracts				1,100,000	2,500,000	1,100,000	5,000,000.0
Revenue recognized excluding sequencing revenue				100,000	200,000	200,000	300,000
Translational Development Agreements \| Maximum
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments		$ 40,000,000.0
MRD Development Agreements
Disaggregation Of Revenue [Line Items]
Revenue recognized				500,000	$ 600,000	800,000	$ 1,900,000
MRD Development Agreements \| Maximum
Disaggregation Of Revenue [Line Items]
Additional milestone payment receivable	115,000,000.0			115,000,000.0		115,000,000.0
Genentech Collaboration Agreement
Disaggregation Of Revenue [Line Items]
Non-refundable upfront payments received			$ 300,000,000.0			300,000,000.0
Revenue from collaboration agreement				8,500,000		$ 14,800,000
Genentech Collaboration Agreement \| Maximum
Disaggregation Of Revenue [Line Items]
Revenue recognition expected period						8 years
Genentech Collaboration Agreement \| Maximum \| Regulatory Milestones
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	75,000,000.0			75,000,000.0		$ 75,000,000.0
Genentech Collaboration Agreement \| Maximum \| Development Milestones
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	300,000,000.0			300,000,000.0		300,000,000.0
Genentech Collaboration Agreement \| Maximum \| Commercial Milestones
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	1,430,000,000.0			1,430,000,000.0		1,430,000,000.0
Genentech Collaboration Agreement \| Minimum
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	$ 1,800,000			$ 1,800,000		$ 1,800,000
Revenue recognition expected period						7 years

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring basis - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financial assets
Total financial assets	$ 420,230	$ 155,986
Financial liabilities
Total financial liabilities	2,602	336
Convertible Preferred Stock Warrant Liability
Financial liabilities
Total financial liabilities	2,602	336
Level 1
Financial assets
Total financial assets	35,695	45,998
Level 2
Financial assets
Total financial assets	384,535	109,988
Level 3
Financial liabilities
Total financial liabilities	2,602	336
Level 3 \| Convertible Preferred Stock Warrant Liability
Financial liabilities
Total financial liabilities	2,602	336
Money Market Funds
Financial assets
Total financial assets	35,695	45,998
Money Market Funds \| Level 1
Financial assets
Total financial assets	35,695	45,998
Commercial Paper
Financial assets
Total financial assets	88,161	16,887
Commercial Paper \| Level 2
Financial assets
Total financial assets	88,161	16,887
U.S. Government Debt and Agency Securities
Financial assets
Total financial assets	273,713	85,623
U.S. Government Debt and Agency Securities \| Level 2
Financial assets
Total financial assets	273,713	85,623
Corporate Bonds
Financial assets
Total financial assets	22,661	7,478
Corporate Bonds \| Level 2
Financial assets
Total financial assets	$ 22,661	$ 7,478

Fair Value Measurements - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Convertible Preferred Stock Warrant Liability
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other income, net	$ 2.3
Level 2 \| Commercial Paper
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	6.0
Level 2 \| U.S. Government Debt and Agency Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 4.0

Fair Value Measurements - Summary of Fair Value of Convertible Preferred Stock Warrant Liability Estimated Using Black-Scholes Option Pricing Model (Details)	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value liability valuation technique [Extensible List]	us-gaap:ValuationTechniqueOptionPricingModelMember	us-gaap:ValuationTechniqueOptionPricingModelMember
Fair Value Estimate \| Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value liability, measurement input	48.30	8.27
Expected Term \| Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected term (in years)	1 year 9 months 21 days	2 years 3 months 21 days
Risk Free Interest Rate \| Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value liability, measurement input	0.018	0.025
Expected Volatility \| Convertible Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value liability, measurement input	0.611	0.553

Investments - Schedule of Available-for-sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 374,161	$ 110,095
Unrealized Gain	383
Unrealized Loss	(1)	(107)
Estimated Fair Value	374,543	109,988
Commercial Paper
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	82,165	16,887
Estimated Fair Value	82,165	16,887
U.S. Government Debt and Agency Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	269,366	85,722
Unrealized Gain	351
Unrealized Loss	(1)	(99)
Estimated Fair Value	269,716	85,623
Corporate Bonds
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	22,630	7,486
Unrealized Gain	32
Unrealized Loss		(8)
Estimated Fair Value	$ 22,662	$ 7,478

Investments - Schedule of Gross Unrealized Holding Losses and Fair Value for Investments in Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Schedule of Available-for-Sale Securities [Line Items]
12 months or greater, Fair value	$ 4,997
12 months or greater, Unrealized loss	(1)
U.S. Government Debt and Agency Securities
Schedule of Available-for-Sale Securities [Line Items]
12 months or greater, Fair value	4,997
12 months or greater, Unrealized loss	$ (1)

Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 118,972,000	$ 118,972,000	$ 0
Purchased Intellectual Property
Goodwill [Line Items]
Amortization period of intangible assets	7 years 6 months

Goodwill and Intangible Assets - Summary of Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 20,325	$ 20,325
Accumulated Amortization	(7,541)	(6,699)
Net Carrying Amount	12,784	13,626
Acquired Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,000	20,000
Accumulated Amortization	(7,462)	(6,636)
Net Carrying Amount	12,538	13,364
Purchased Intellectual Property
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	325	325
Accumulated Amortization	(79)	(63)
Net Carrying Amount	$ 246	$ 262

Goodwill and Intangible Assets - Schedule of Future Amortization Expense for Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
2019	$ 856
2020	1,698
2021	1,698
2022	1,698
2023	1,698
Thereafter	5,136
Net Carrying Amount	$ 12,784	$ 13,626

Deferred Revenue - Schedule of Deferred Revenue by Revenue Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current deferred revenue
Total current deferred revenue	$ 61,194	$ 12,695
Non-current deferred revenue
Total non-current deferred revenue	240,919	704
Total current and non-current deferred revenue	302,113	13,399
Sequencing Revenue
Current deferred revenue
Total current deferred revenue	14,616	11,238
Non-current deferred revenue
Total non-current deferred revenue	493	516
Development Revenue
Current deferred revenue
Total current deferred revenue	46,578	1,457
Non-current deferred revenue
Total non-current deferred revenue	$ 240,426	$ 188

Deferred Revenue - Additional Information (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Current deferred revenue	$ 61,194	$ 61,194	$ 12,695
Deferred revenue, less current portion	240,919	240,919	704
Revenue recognized	4,400	19,341
Development Revenue
Disaggregation Of Revenue [Line Items]
Current deferred revenue	46,578	46,578	1,457
Deferred revenue, less current portion	240,426	240,426	188
Development Revenue \| Genentech, Inc.
Disaggregation Of Revenue [Line Items]
Current deferred revenue	45,000	45,000
Deferred revenue, less current portion	240,200	240,200
Sequencing Revenue
Disaggregation Of Revenue [Line Items]
Current deferred revenue	14,616	14,616	11,238
Deferred revenue, less current portion	$ 493	493	$ 516
Revenue recognized		$ 800

Deferred Revenue - Additional Information (Details1) - Genentech, Inc. - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-07-01	Jun. 30, 2019
Minimum
Disaggregation Of Revenue [Line Items]
Deferred revenue, expected to be recognized	12 months
Maximum
Disaggregation Of Revenue [Line Items]
Deferred revenue, expected to be recognized	8 years

Deferred Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Deferred revenue balance at December 31, 2018		$ 13,399
Additions to deferred revenue during the period (unaudited)		308,055
Revenue recognized during the period (unaudited)	$ (4,400)	(19,341)
Deferred revenue balance at June 30, 2019 (unaudited)	$ 302,113	$ 302,113

Commitment and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Lease term description			The lease term is through March 2026 and provides for one five-year option.
Payments for tenant improvements			$ 2.4
Rent expenses	$ 1.1	$ 0.9	$ 2.3	$ 1.8

Commitments and Contingencies - Schedule of Future Minimum Lease Payments Under Operating Leases (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2019	$ 1,781
2020	3,819
2021	3,917
2022	4,017
2023	2,295
Thereafter	2,315
Total future minimum lease payments	$ 18,144

Convertible Preferred Stock - Schedule of Convertible Preferred Stock (Details) - USD ($)
$ in Thousands

Jun. 30, 2019

Dec. 31, 2018

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

93,762,517

Convertible preferred stock,Shares Issued and Outstanding

93,039,737

Convertible preferred stock,Amount

$ 561,931

$ 560,858

Convertible preferred stock,Liquidation Preference

$ 574,374

$ 572,866

Series A

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

4,550,000

Convertible preferred stock,Shares Issued and Outstanding

4,550,000

Convertible preferred stock,Amount

$ 12,405

Convertible preferred stock,Liquidation Preference

$ 4,550

Series B

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

5,645,706

Convertible preferred stock,Shares Issued and Outstanding

5,645,706

Convertible preferred stock,Amount

$ 16,018

Convertible preferred stock,Liquidation Preference

$ 9,669

Series C

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

4,804,227

Convertible preferred stock,Shares Issued and Outstanding

4,747,352

Convertible preferred stock,Amount

$ 14,425

Convertible preferred stock,Liquidation Preference

$ 12,521

Series D

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

19,269,117

Convertible preferred stock,Shares Issued and Outstanding

19,269,117

Convertible preferred stock,Amount

$ 106,905

Convertible preferred stock,Liquidation Preference

$ 106,999

Series E

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

15,524,350

Convertible preferred stock,Shares Issued and Outstanding

15,524,350

Convertible preferred stock,Amount

$ 93,698

Convertible preferred stock,Liquidation Preference

$ 93,750

Series E-1

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

17,407,441

Convertible preferred stock,Shares Issued and Outstanding

16,854,887

Convertible preferred stock,Amount

^[1]

$ 73,640

Convertible preferred stock,Liquidation Preference

$ 101,785

Series F

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

21,761,676

Convertible preferred stock,Shares Issued and Outstanding

21,761,676

Convertible preferred stock,Amount

$ 195,013

Convertible preferred stock,Liquidation Preference

$ 195,100

Series F-1

Temporary Equity [Line Items]

Convertible preferred stock,Shares Authorized

4,800,000

Convertible preferred stock,Shares Issued and Outstanding

4,686,649

Convertible preferred stock,Amount

$ 49,827

Convertible preferred stock,Liquidation Preference

$ 50,000

[1]	Includes vested Series E-1 convertible preferred stock options of $0.7 million which are not included in the shares issued and outstanding.

Convertible Preferred Stock - Schedule of Convertible Preferred Stock (Parenthetical) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Series E-1 Convertible Preferred Stock
Temporary Equity [Line Items]
Convertible preferred stock options, vested	$ 0.7

Shareholders' Deficit - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019 Vote $ / shares shares	Dec. 31, 2018 $ / shares shares
Class Of Stock [Line Items]
Common stock authorized \| shares	131,000,000	131,000,000
Common stock par value \| $ / shares	$ 0.0001	$ 0.0001
Common stock voting rights description	Holders of our common stock are entitled to one vote for each share of common stock held
Number of vote for each share \| Vote	1
Common Stock
Class Of Stock [Line Items]
Warrant to purchase common stock, shares \| shares	20,000
Warrant exercisable term	10 years
Weighted-average exercise price of warrants \| $ / shares	$ 0.37
Exercise price of warrants \| $ / shares	$ 0.45
Maximum \| Common Stock
Class Of Stock [Line Items]
Warrant to purchase common stock, shares \| shares	55,032

Shareholders' Deficit - Summary of Reserved Shares of Common Stock (Details)	Jun. 30, 2019 shares
Class Of Stock [Line Items]
Shares of common stock reserved for future issuance	114,004,082
Exercise of Outstanding Common Stock Options
Class Of Stock [Line Items]
Shares of common stock reserved for future issuance	17,681,436
Stock Option Grants
Class Of Stock [Line Items]
Shares of common stock reserved for future issuance	3,155,968
Conversion of Common Stock Warrants
Class Of Stock [Line Items]
Shares of common stock reserved for future issuance	55,032
Conversion of All Series of Convertible Preferred Stock
Class Of Stock [Line Items]
Shares of common stock reserved for future issuance	93,039,737
Series E-1 Convertible Preferred Stock
Class Of Stock [Line Items]
Shares of common stock reserved for future issuance	15,034
Conversion of Series C Convertible Preferred Stock in Connection with Warrant Exercise
Class Of Stock [Line Items]
Shares of common stock reserved for future issuance	56,875

Equity Incentive Plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	$ 3,332	$ 2,448	$ 6,378	$ 5,550
Unrecognized share-based compensation expense related to unvested stock options	$ 33,200		$ 33,200
Unrecognized share-based compensation expense related to unvested stock options, weighted-average period for recognition			3 years 1 month 28 days
Option Valuation Model
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected dividend yield			0.00%
2009 Equity Incentive Plan \| Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for issuance	20,837,404		20,837,404
2009 Equity Incentive Plan \| Options \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option expiration period			10 years

Equity Incentive Plans - Summary of Option Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)
2009 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Available for Grant, Outstanding, Beginning Balance	6,827,996
Shares Available for Grant, Options granted (unaudited)	(3,890,331)
Shares Available for Grant, Forfeited or cancelled (unaudited)	218,303
Shares Available for Grant, Outstanding, Ending Balance (unaudited)	3,155,968
Shares Subject to Outstanding Options, Outstanding, Beginning Balance	14,893,253
Shares Subject to Outstanding Options, Options granted (unaudited)	3,890,331
Shares Subject to Outstanding Options, Forfeited or cancelled (unaudited)	(218,303)
Shares Subject to Outstanding Options, Exercised (unaudited)	(883,845)
Shares Subject to Outstanding Options, Outstanding, Ending Balance (unaudited)	17,681,436
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance \| $ / shares	$ 4.59
Weighted Average Exercise Price per Share, Options granted (unaudited) \| $ / shares	7.55
Weighted Average Exercise Price per Share, Forfeited or cancelled (unaudited) \| $ / shares	6.19
Weighted Average Exercise Price per Share, Exercised (unaudited) \| $ / shares	2.13
Weighted Average Exercise Price per Share, Outstanding, Ending Balance (unaudited) \| $ / shares	$ 5.35
Aggregate Intrinsic Value, Outstanding \| $	$ 759,479	$ 39,864
Sequenta, Inc. 2008 Stock Plan \| Series E-1 Convertible Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Subject to Outstanding Options, Outstanding, Beginning Balance	264,677
Shares Subject to Outstanding Options, Exercised (unaudited)	(249,643)
Shares Subject to Outstanding Options, Outstanding, Ending Balance (unaudited)	15,034
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance \| $ / shares	$ 0.44
Weighted Average Exercise Price per Share, Exercised (unaudited) \| $ / shares	0.44
Weighted Average Exercise Price per Share, Outstanding, Ending Balance (unaudited) \| $ / shares	$ 0.49
Aggregate Intrinsic Value, Outstanding \| $	$ 719	$ 1,826

Equity Incentive Plans - Summary of Estimated Fair Value of Options Granted (Details) - Adaptive 2009 Equity Incentive Plan - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date fair value	$ 8.55	$ 6.55
Expected term (in years)	6 years 21 days	6 years 1 month 28 days
Risk-free interest rate	2.40%	2.70%
Expected volatility	67.90%	69.20%

Equity incentive Plans - Summary of Compensation Costs Related to Stock Options Included in Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	$ 3,332	$ 2,448	$ 6,378	$ 5,550
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	113	92	243	176
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	978	652	1,895	1,468
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	943	592	1,849	1,549
General and Administration
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	$ 1,298	$ 1,112	$ 2,391	$ 2,357

Net Loss Per Share Attributable to Common Shareholders - Computation of the Basic and Diluted Net Loss Per Share Attributable to Common Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss	$ (15,659)	$ (12,493)	$ (34,045)	$ (24,884)
Fair value adjustments to redemption value for Series E-1 convertible preferred stock options	(710)	(2)	(964)	2
Net loss attributable to common shareholders, basic and diluted	$ (16,369)	$ (12,495)	$ (35,009)	$ (24,882)
Weighted-average shares used in computing net loss per share attributable to common shareholders, basic and diluted	13,279,324	12,385,888	13,074,692	12,334,227
Net loss per share attributable to common shareholders, basic and diluted	$ (1.23)	$ (1.01)	$ (2.68)	$ (2.02)
Series E-1 Convertible Preferred Stock
Fair value adjustments to redemption value for Series E-1 convertible preferred stock options	$ (710)	$ (2)	$ (964)	$ 2

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss Per Share Attributable to Common Shareholders - Weighted-Average Common Stock Equivalents were Excluded From Calculation of Diluted Net Loss Per Share Attributable to Common Shareholders (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible preferred stock (on as if converted basis)	110,758,398	107,842,523	109,993,511	107,194,266
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible preferred stock (on as if converted basis)	93,028,311	92,768,158	92,973,101	92,751,261
Options \| 2009 Plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible preferred stock (on as if converted basis)	17,591,720	14,597,833	16,826,833	13,927,507
Options \| 2008 Plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible preferred stock (on as if converted basis)	26,460	364,625	81,670	403,591
Common Stock Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible preferred stock (on as if converted basis)	55,032	55,032	55,032	55,032
Convertible Preferred Stock Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible preferred stock (on as if converted basis)	56,875	56,875	56,875	56,875

Subsequent Events - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019	Aug. 13, 2019 USD ($) ft²
Subsequent Event [Line Items]
Operating lease description	In August 2019, we entered into an operating lease to rent 100,000 square feet in a to-be-constructed building in Seattle, Washington. Shell construction is expected to be completed in 2020. The lease term commences on the date that the landlord delivers the premises to us for construction of certain tenant improvements. Rent obligations commence 10 months thereafter, and the lease term ends 142 months form the date rent commences, subject to our option to twice extend the lease for five years. The lease is cancellable under certain circumstances if the landlord fails to deliver the premises to us by May 1, 2021. We plan to occupy the new building in 2021, once interior construction is finished. The lease also requires us to pay additional amounts for operating and maintenance expenses.
Option to extend the lease term, description	our option to twice extend the lease for five years
Subsequent Event
Subsequent Event [Line Items]
Operating lease to rent in a to-be constructed building		100,000
Letter of credit \| $		$ 2.1
Expand the size of the existing premises by area		8,400

Subsequent Events - Schedule of Future Minimum Lease Payments Under Operating Leases (Detail) - USD ($) $ in Thousands	Aug. 13, 2019	Jun. 30, 2019
Lessee Lease Description [Line Items]
2019		$ 1,781
2020		3,819
2021		3,917
2022		4,017
2023		2,295
Thereafter		2,315
Total future minimum lease payments		$ 18,144
Subsequent Event
Lessee Lease Description [Line Items]
2019	$ 1,431
2020	3,053
2021	5,802
2022	9,706
2023	9,975
Thereafter	105,270
Total future minimum lease payments	$ 135,237