Document and Entity Information
Document and Entity Information - USD ($) | 12 Months Ended | ||
Dec. 31, 2020 | Feb. 18, 2021 | Jun. 30, 2020 | |
Cover [Abstract] | |||
Document Type | 10-K | ||
Amendment Flag | false | ||
Document Period End Date | Dec. 31, 2020 | ||
Document Fiscal Year Focus | 2020 | ||
Document Fiscal Period Focus | FY | ||
Trading Symbol | ATRA | ||
Entity Registrant Name | ATARA BIOTHERAPEUTICS, INC. | ||
Entity Central Index Key | 0001604464 | ||
Current Fiscal Year End Date | --12-31 | ||
Entity Well-known Seasoned Issuer | Yes | ||
Entity Current Reporting Status | Yes | ||
Entity Voluntary Filers | No | ||
Entity Filer Category | Large Accelerated Filer | ||
Entity Common Stock, Shares Outstanding | 83,614,853 | ||
Entity Public Float | $ 906,895,284 | ||
Entity Shell Company | false | ||
Entity Small Business | false | ||
Entity Emerging Growth Company | false | ||
Entity File Number | 001-36548 | ||
Entity Tax Identification Number | 46-0920988 | ||
Entity Address, Address Line One | 611 Gateway Blvd. | ||
Entity Address, Address Line Two | Suite 900 | ||
Entity Address, City or Town | South San Francisco | ||
Entity Address, State or Province | CA | ||
Entity Address, Postal Zip Code | 94080 | ||
City Area Code | 650 | ||
Local Phone Number | 278-8930 | ||
Entity Incorporation, State or Country Code | DE | ||
Title of 12(b) Security | Common Stock, par value $0.0001 per share | ||
Security Exchange Name | NASDAQ | ||
Entity Interactive Data Current | Yes | ||
Document Annual Report | true | ||
Document Transition Report | false | ||
ICFR Auditor Attestation Flag | true | ||
Documents Incorporated by Reference | Portions of the Registrant’s definitive proxy statement relating to its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Report where indicated. Such proxy statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates. |
Consolidated Balance Sheets
Consolidated Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 |
Current assets: | ||
Cash and cash equivalents | $ 200,404 | $ 74,317 |
Short-term investments | 300,255 | 184,792 |
Restricted cash - short-term | 194 | 194 |
Accounts receivable | 1,250 | 0 |
Prepaid expenses and other current assets | 21,170 | 13,689 |
Total current assets | 523,273 | 272,992 |
Property and equipment, net | 50,517 | 54,176 |
Operating lease assets | 12,303 | 14,007 |
Restricted cash - long-term | 1,200 | 1,200 |
Other assets | 827 | 567 |
Total assets | 588,120 | 342,942 |
Current liabilities: | ||
Accounts payable | 7,118 | 7,963 |
Accrued compensation | 20,458 | 14,706 |
Accrued research and development expenses | 15,813 | 8,341 |
Deferred revenue | 33,455 | 0 |
Other current liabilities | 6,057 | 5,733 |
Total current liabilities | 82,901 | 36,743 |
Deferred revenue - long-term | 27,795 | 0 |
Operating lease liabilities - long-term | 13,041 | 14,136 |
Other long-term liabilities | 2,044 | 1,282 |
Total liabilities | 125,781 | 52,161 |
Commitments and contingencies (Note 9) | ||
Stockholders’ equity: | ||
Common stock—$0.0001 par value, 500,000 shares authorized as of December 31, 2020 and 2019, respectively; 83,372 and 56,806 shares issued and outstanding as of December 31, 2020 and 2019, respectively | 8 | 6 |
Additional paid-in capital | 1,586,616 | 1,108,516 |
Accumulated other comprehensive income | 296 | 220 |
Accumulated deficit | (1,124,581) | (817,961) |
Total stockholders’ equity | 462,339 | 290,781 |
Total liabilities and stockholders’ equity | $ 588,120 | $ 342,942 |
Consolidated Balance Sheets (Pa
Consolidated Balance Sheets (Parenthetical) - $ / shares | Dec. 31, 2020 | Dec. 31, 2019 |
Statement Of Financial Position [Abstract] | ||
Common stock, par value | $ 0.0001 | $ 0.0001 |
Common stock, shares authorized | 500,000,000 | 500,000,000 |
Common stock, shares issued | 83,372,000 | 56,806,000 |
Common stock, shares outstanding | 83,372,000 | 56,806,000 |
Consolidated Statements of Oper
Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Operating expenses: | |||
Research and development | $ 244,650 | $ 216,097 | $ 167,457 |
General and administrative | 64,402 | 79,584 | 69,654 |
Total operating expenses | 309,052 | 295,681 | 237,111 |
Loss from operations | (309,052) | (295,681) | (237,111) |
Interest and other income, net | 2,447 | 4,717 | 6,368 |
Loss before provision for income taxes | (306,605) | (290,964) | (230,743) |
Provision for (benefit from) income taxes | 15 | 12 | (44) |
Net loss | (306,620) | (290,976) | (230,699) |
Other comprehensive gain (loss): | |||
Unrealized gain (loss) on available-for-sale securities | 76 | 560 | (189) |
Comprehensive loss | $ (306,544) | $ (290,416) | $ (230,888) |
Net loss per common share: | |||
Basic and diluted net loss per common share | $ (4.15) | $ (5.67) | $ (5.27) |
Weighted-average shares outstanding used to calculate basic and diluted net loss per common share | 73,973 | 51,308 | 43,811 |
Consolidated Statements of Stoc
Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | At The Market Offering | Underwritten Public Offering | Common Stock | Common StockCumulative Effect, Period of Adoption, Adjusted Balance | Common StockAt The Market Offering | Common StockUnderwritten Public Offering | Additional Paid-in Capital | Additional Paid-in CapitalCumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in CapitalAt The Market Offering | Additional Paid-in CapitalUnderwritten Public Offering | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Deficit | Accumulated DeficitCumulative Effect, Period of Adoption, Adjustment | Accumulated DeficitCumulative Effect, Period of Adoption, Adjusted Balance |
Beginning balance at Dec. 31, 2017 | $ 177,864 | $ 3 | $ 474,662 | $ (151) | $ (296,650) | |||||||||||||
Beginning balance (in shares) at Dec. 31, 2017 | 30,730 | |||||||||||||||||
Issuance of common stock, net of offering costs, values | $ 293,290 | $ 2 | $ 293,288 | |||||||||||||||
Issuance of common stock, net Of offering costs, shares | 12,604 | |||||||||||||||||
Issuance of common stock, net of commissions and offering costs, value | $ 47,586 | $ 47,586 | ||||||||||||||||
Issuance of common stock, net of commissions and offering costs, shares | 1,008 | |||||||||||||||||
RSU settlements, net of shares withheld | (7,503) | (7,503) | ||||||||||||||||
RSU settlements, net of shares withheld, shares | 449 | |||||||||||||||||
Issuance of common stock pursuant to employee stock awards | 24,691 | 24,691 | ||||||||||||||||
Issuance of common stock pursuant to employee stock awards, shares | 1,160 | |||||||||||||||||
Stock-based compensation expense | 33,817 | 33,817 | ||||||||||||||||
Net loss | (230,699) | (230,699) | ||||||||||||||||
Unrealized gain (loss) on available-for-sale securities | (189) | (189) | ||||||||||||||||
Ending balance at Dec. 31, 2018 | $ 338,857 | $ 364 | $ 339,221 | $ 5 | $ 5 | 866,541 | $ 866,541 | (340) | $ (340) | (527,349) | $ 364 | $ (526,985) | ||||||
Ending balance (in shares) at Dec. 31, 2018 | 45,951 | 45,951 | ||||||||||||||||
Accounting Standards Update Extensible List | us-gaap:AccountingStandardsUpdate201602Member | |||||||||||||||||
Issuance of common stock and pre-funded warrants, net of offering costs | 140,716 | $ 1 | 140,715 | |||||||||||||||
Issuance of common stock and pre-funded warrants, net of offering costs, shares | 6,872 | |||||||||||||||||
Issuance of common stock, net of commissions and offering costs, value | 48,909 | 48,909 | ||||||||||||||||
Issuance of common stock, net of commissions and offering costs, shares | 3,135 | |||||||||||||||||
RSU settlements, net of shares withheld | $ (6,695) | (6,695) | ||||||||||||||||
RSU settlements, net of shares withheld, shares | 361 | |||||||||||||||||
Issuance of common stock pursuant to employee stock awards | 7,350 | 7,350 | ||||||||||||||||
Issuance of common stock pursuant to employee stock awards, shares | 487 | |||||||||||||||||
Stock-based compensation expense | 51,696 | 51,696 | ||||||||||||||||
Net loss | (290,976) | (290,976) | ||||||||||||||||
Unrealized gain (loss) on available-for-sale securities | 560 | 560 | ||||||||||||||||
Ending balance at Dec. 31, 2019 | 290,781 | $ 6 | 1,108,516 | 220 | (817,961) | |||||||||||||
Ending balance (in shares) at Dec. 31, 2019 | 56,806 | |||||||||||||||||
Issuance of common stock and pre-funded warrants, net of offering costs | $ 353,588 | $ 2 | $ 353,586 | |||||||||||||||
Issuance of common stock and pre-funded warrants, net of offering costs, shares | 20,060 | |||||||||||||||||
Issuance of common stock, net of commissions and offering costs, value | $ 68,004 | $ 68,004 | ||||||||||||||||
Issuance of common stock, net of commissions and offering costs, shares | 4,786 | |||||||||||||||||
Exercise of pre-funded warrants, shares | 57 | |||||||||||||||||
RSU settlements, net of shares withheld | (1,521) | (1,521) | ||||||||||||||||
RSU settlements, net of shares withheld, shares | 1,112 | |||||||||||||||||
Issuance of common stock pursuant to employee stock awards | 6,680 | 6,680 | ||||||||||||||||
Issuance of common stock pursuant to employee stock awards, shares | 551 | |||||||||||||||||
Stock-based compensation expense | 51,351 | 51,351 | ||||||||||||||||
Net loss | (306,620) | (306,620) | ||||||||||||||||
Unrealized gain (loss) on available-for-sale securities | 76 | 76 | ||||||||||||||||
Ending balance at Dec. 31, 2020 | $ 462,339 | $ 8 | $ 1,586,616 | $ 296 | $ (1,124,581) | |||||||||||||
Ending balance (in shares) at Dec. 31, 2020 | 83,372 |
Consolidated Statements of St_2
Consolidated Statements of Stockholders' Equity (Parenthetical) - Common Stock - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Underwritten Public Offering | |||
Stock issuance, discounts, commissions and offering costs | $ 583 | $ 284 | $ 526 |
At The Market Offering | |||
Stock issuance, discounts, commissions and offering costs | $ 1,887 | $ 1,553 | $ 1,310 |
Consolidated Statements of Cash
Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Operating activities | |||
Net loss | $ (306,620) | $ (290,976) | $ (230,699) |
Adjustments to reconcile net loss to net cash used in operating activities: | |||
Stock-based compensation expense | 51,351 | 51,696 | 33,817 |
Depreciation and amortization expense | 8,332 | 7,070 | 3,732 |
Non-cash operating lease expense | 1,457 | 964 | 0 |
Amortization (accretion) of investment premiums (discounts) | 828 | (1,330) | (1,885) |
Loss on disposals of property and equipment | 130 | 1,027 | 0 |
Asset retirement obligation accretion expense | 78 | 71 | 49 |
Non-cash interest expense | 0 | 0 | 211 |
Changes in operating assets and liabilities: | |||
Accounts receivable | (1,250) | 0 | 0 |
Prepaid expenses and other current assets | (8,666) | (998) | (5,764) |
Operating lease assets | 886 | 239 | 0 |
Other assets | (219) | 322 | (314) |
Accounts payable | (815) | 4,213 | (1,958) |
Accrued compensation | 5,752 | 4,070 | 4,972 |
Accrued research and development expenses | 7,472 | (10,869) | 15,204 |
Other current liabilities | (187) | (394) | 2,491 |
Deferred revenue | 61,250 | 0 | 0 |
Operating lease liabilities | (1,316) | (731) | 0 |
Other long-term liabilities | 778 | 0 | 372 |
Net cash used in operating activities | (180,759) | (235,626) | (179,772) |
Investing activities | |||
Purchases of short-term investments | (425,868) | (270,230) | (466,489) |
Proceeds from maturities and sales of short-term investments | 309,653 | 336,261 | 306,125 |
Purchases of property and equipment | (4,513) | (5,733) | (35,925) |
Proceeds from sale of property and equipment | 0 | 161 | 0 |
Net cash (used in) provided by investing activities | (120,728) | 60,459 | (196,289) |
Financing activities | |||
Proceeds from sale of common stock and pre-funded warrants in underwritten offerings, net | 353,780 | 140,888 | 293,290 |
Proceeds from issuance of common stock through ATM facilities, net | 69,189 | 47,729 | 47,586 |
Proceeds from employee stock awards | 6,680 | 7,350 | 24,691 |
Taxes paid related to net share settlement of restricted stock units | (1,521) | (6,695) | (7,503) |
Principal payments on finance and capital lease obligations | (389) | (486) | (528) |
Other financing activities, net | (165) | 0 | 0 |
Net cash provided by financing activities | 427,574 | 188,786 | 357,536 |
Increase (decrease) in cash, cash equivalents and restricted cash | 126,087 | 13,619 | (18,525) |
Cash, cash equivalents and restricted cash at beginning of period | 75,711 | 62,092 | 80,617 |
Cash, cash equivalents and restricted cash at end of period | 201,798 | 75,711 | 62,092 |
Non-cash investing and financing activities | |||
Property and equipment purchases included in accounts payable and other accrued liabilities | 326 | 276 | 1,579 |
Accrued costs related to underwritten public offering | 192 | 172 | 0 |
Proceeds from issuance of common stock through ATM facilities not yet received | 0 | 1,185 | 0 |
Capitalized lease obligations | 0 | 0 | 441 |
Property and equipment acquired under capital leases | 0 | 0 | 191 |
Asset retirement costs | 0 | 0 | 88 |
Interest capitalized during construction period for build-to-suit lease arrangement | 0 | 0 | 77 |
Supplemental cash flow disclosure | |||
Cash paid for interest | 62 | 50 | 240 |
Cash paid for income taxes | $ 10 | $ 0 | $ 0 |
Description of Business
Description of Business | 12 Months Ended |
Dec. 31, 2020 | |
Description Of Business [Abstract] | |
Description of Business | 1. Description of Business Atara Biotherapeutics, Inc. (“Atara”, “we”, “our” or “the Company”) was incorporated in August 2012 in Delaware. Atara is a pioneer in T-cell immunotherapy, leveraging its novel allogeneic EBV T-cell platform to develop transformative therapies for patients with serious diseases, including solid tumors, hematologic cancers and autoimmune disease. We have several T-cell immunotherapies in clinical development and are progressing multiple next-generation allogeneic chimeric antigen receptor T-cell (“CAR T”) programs. We have entered into a research, development and license agreement (“Bayer License Agreement”) with Bayer AG (“Bayer”) pursuant to which we granted to Bayer an exclusive, field-limited license under the applicable patents and know-how owned or controlled by us and our affiliates covering or related to ATA2271 and ATA3271. See Note 7 for further information. We have licensed rights to T-cell product candidates from Memorial Sloan Kettering Cancer Center (“MSK”), rights related to our next-generation CAR T programs from MSK and from Moffitt Cancer Center, and rights to know-how and technology from the Council of the Queensland Institute of Medical Research |
Summary of Significant Accounti
Summary of Significant Accounting Policies | 12 Months Ended |
Dec. 31, 2020 | |
Accounting Policies [Abstract] | |
Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies Basis of Presentation We prepare our consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and follow the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Principles of Consolidation The consolidated financial statements include the accounts of Atara and our wholly owned subsidiaries. All intercompany balances and transactions are eliminated in consolidation. Segment and Geographic Information We operate and manage our business as one operating and reportable segment, which is the business of developing and commercializing therapeutics. Our Chief Executive Officer, who is our chief operating decision maker, reviews financial information on an aggregate basis for purposes of allocating resources and evaluating financial performance. Substantially all of our assets are located in the U.S. Liquidity Risk We have incurred significant operating losses since inception and have relied primarily on public and private equity financings to fund our operations. As we continue to incur losses, our transition to profitability will depend on the successful development, approval and commercialization of product candidates and on the achievement of sufficient revenues to support our cost structure. We may never achieve profitability, and unless and until we do, we will need to continue to raise additional capital. We expect that existing cash, cash equivalents and short-term investments as of December 31, 2020 will be sufficient to fund our operations for at least the next twelve months from the date of issuance of these financial statements. Concentration of Credit Risk and Other Uncertainties We place cash and cash equivalents in the custody of financial institutions that management believes are of high credit quality, the amount of which at times, may be in excess of the amount insured by the Federal Deposit Insurance Corporation. We also make short-term investments in money market funds; U.S. Treasury, government agency and corporate debt obligations; commercial paper; certificates of deposit; and asset-backed securities, which can be subject to certain credit risk. However, we mitigate the risks by investing in high-grade instruments, limiting our exposure to any one issuer and monitoring the ongoing creditworthiness of the financial institutions and issuers. O ne research, development and license agreement entered into in 2020 accounted for all of the deferred revenue as of December 31, 2020 . For the year ended December 31, 2020 , we did not recognize any revenue from this agreement. Our accounts receivable balance consists of amounts due pursuant to this agreement. We believe the receivable balance is fully collectible. We are subject to certain risks and uncertainties and believe that changes in any of the following areas could have a material adverse effect on future financial position or results of operations: our ability to obtain future financing; regulatory approval and market acceptance of, and reimbursement for, our product candidates, if approved by applicable regulatory authorities; performance of third-party clinical research organizations and manufacturers upon which we rely; development of sales channels; protection of our intellectual property; litigation or claims against us based on intellectual property, patent, product, regulatory or other factors; and our ability to attract and retain employees necessary to support our growth. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates, assumptions and judgments that affect the amounts reported in the financial statements and accompanying notes. Significant estimates relied upon in preparing these financial statements include estimates related to revenue recognition, clinical study and other accruals, stock-based compensation expense and income taxes. Actual results could differ materially from those estimates. Leases On January 1, 2019, we adopted Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842) We determine if an arrangement is a lease at inception. Operating leases are included in operating lease assets, other current liabilities, and operating lease liabilities on our consolidated balance sheets. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize short-term lease expense for these leases on a straight-line basis over the lease term. Finance leases are included in other assets, other current liabilities, and other long-term liabilities on our consolidated balance sheets. Lease assets and lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. The lease term includes renewal options that we are reasonably certain of exercising as of the commencement date. None of the lease terms used to calculate the future minimum lease payments at commencement date include renewal options. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The incremental borrowing rate for our leases is determined based on lease term and currency in which lease payments are made, adjusted for impacts of collateral. Lease assets also includes any lease payments made and excludes lease incentives and initial direct costs incurred. Operating lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. Finance lease assets are amortized over the shorter of the lease term or the asset’s estimated useful life. Our facilities and equipment operating leases have lease and non-lease components and we have made a policy election to account for the lease and non-lease components as a single lease component. Through December 31, 2018, the leases were reviewed for classification as operating, capital or build-to-suit leases. For operating leases, rent was recognized on a straight-line basis over the lease period. For capital leases, we recorded the leased asset in property and equipment, net, with the related amortization of the capital lease asset recorded in depreciation expense, and we recorded a corresponding liability for principal and interest. Payments were recorded as reductions to these liabilities with interest being charged to interest expense in our consolidated statements of operations and comprehensive loss. We analyzed the nature of the renovations and our involvement during the construction period of our manufacturing facility and determined that we were the deemed “owner” of the construction project during the construction period. As a result, we were required to capitalize the fair value of the building as well as the construction costs incurred on our consolidated balance sheet along with a corresponding financing liability for landlord-paid construction costs (i.e., “build-to-suit” accounting). Once construction was complete, the Company considered the requirements for sale-leaseback accounting treatment, including evaluating whether all risks of ownership have been transferred back to the landlord, as evidenced by a lack of continuing involvement in the leased property. Since the arrangement did not qualify for sale-leaseback accounting treatment, the building asset remained on the Company’s consolidated balance sheets at its historical cost, and such asset was depreciated over its estimated useful life. The Company bifurcated its lease payments into a portion allocated to the building and a portion allocated to the parcel of land on which the building has been built. The portion of the lease payments allocated to the land was treated for accounting purposes as operating lease payments, and therefore was recorded as rent expense in the consolidated statements of operations and comprehensive loss. The portion of the lease payments allocated to the building was further bifurcated into a portion allocated to interest expense and a portion allocated to reduce the build-to-suit lease obligation. The initial recording of these assets and liabilities were classified as non-cash investing and financing items, respectively, for purposes of the consolidated statements of cash flows. The build-to-suit asset and corresponding lease obligation was derecognized upon adoption of the new lease standard as we did not control the building during the construction period. See Note 8 for further information. Asset Retirement Obligations (“ARO”) ARO are legal obligations associated with the retirement of long-lived assets pertaining to leasehold improvements. These liabilities are initially recorded at fair value and the related asset retirement costs are capitalized by increasing the carrying amount of the related assets by the same amount as the liability. Asset retirement costs are subsequently depreciated over the useful lives of the related assets. Subsequent to initial recognition, the Company records period-to-period changes in the ARO liability resulting from the passage of time and revisions to either the timing or the amount of the original estimate of undiscounted cash flows. The Company derecognizes ARO liabilities when the related obligations are settled. Foreign Currency Transactions and monetary assets and liabilities that are denominated in a foreign currency are translated into U.S. dollars at the current exchange rate on the transaction date and as of each balance sheet date, respectively, with gains or losses on foreign exchange changes recognized in interest and other income (expense), net in the consolidated statements of operations and comprehensive loss. Foreign currency-denominated monetary assets and liabilities as of December 31, 2020 were not material. Cash Equivalents and Short-Term Investments Cash equivalents are defined as short-term, highly liquid investments with original maturities of 90 days or less at the date of purchase, and generally consist of money market funds, U.S. Treasury, government agency and corporate debt obligations, and commercial paper. Investments with original maturities of greater than 90 days are classified as short-term investments on the balance sheet, and consist primarily of U.S. Treasury, government agency and corporate debt obligations, commercial paper and asset-backed securities. As our entire investment portfolio is considered available for use in current operations, we classify all investments as available-for-sale and as current assets, even though the stated maturity may be more than one year from the current balance sheet date. Available-for-sale securities are carried at fair value, with unrealized gains and losses reported in accumulated other comprehensive loss, which is a separate component of stockholders’ equity in the consolidated balance sheet. The amortized cost of securities is adjusted for amortization of premiums and accretion of discounts to maturity, which are both recorded to interest and other income (expense), net in the consolidated statements of operations and comprehensive loss. Changes in the fair value of available-for-sale securities impact the consolidated statements of operations and comprehensive loss only when such securities are sold, if an allowance for credit losses is recognized or if an impairment is recognized. Realized gains and losses on the sale of securities are determined by specific identification of each security’s cost basis. We regularly review our investment portfolio to determine if any security is impaired, which would require us to record an allowance for credit losses or impairment charge in the period any such determination is made. In making this judgment, we evaluate, among other things, the duration and extent to which the fair value of a security is less than its cost, our intent to sell or whether it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis, the financial condition of the issuer and any changes thereto, and, as necessary, the portion of a decline in fair value that is credit-related. This assessment could change in the future due to new developments or changes in assumptions related to any particular security. Realized gains and losses, allowances for credit losses and impairments on available-for-sale securities, if any, are recorded to interest and other income, net in the statements of operations and comprehensive loss. Fair Value Measurement The carrying amounts of certain of our financial instruments including cash equivalents, accounts receivable, prepaid expenses and other current assets, accounts payable and accrued liabilities approximate fair value due to their short maturities. Short-term investments are comprised of available-for-sale securities, which are carried at fair value. Fair Value of Financial Instruments Our financial assets are measured at fair value on a recurring basis using the following hierarchy to prioritize valuation inputs, Level 1: Quoted prices in active markets for identical assets or liabilities that we have the ability to access Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data such as quoted prices, interest rates and yield curves Level 3: Inputs that are unobservable data points that are not corroborated by market data We review the fair value hierarchy classification on a quarterly basis. Changes in the ability to observe valuation inputs may result in a reclassification of levels of certain securities within the fair value hierarchy. We recognize transfers into and out of levels within the fair value hierarchy in the period in which the actual event or change in circumstances that caused the transfer occurs. There have been no transfers between Level 1, Level 2, and Level 3 in any periods presented. Financial assets and liabilities are considered Level 2 when their fair values are determined using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing for similar securities, recently executed transactions, cash flow models with yield curves, and benchmark securities. In addition, Level 2 financial instruments are valued using comparisons to like-kind financial instruments and models that use readily observable market data as their basis. U.S. Treasury, government agency and corporate debt obligations, commercial paper and asset-backed securities are valued primarily using market prices of comparable securities, bid/ask quotes, interest rate yields and prepayment spreads and are included in Level 2. Financial assets and liabilities are considered Level 3 when their fair values are determined using pricing models, discounted cash flow methodologies, or similar techniques, and at least one significant model assumption or input is unobservable. We have no Level 3 financial assets or liabilities. Property and Equipment, net Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the assets, ranging from three to five years. Costs incurred to acquire, construct or install property and equipment during the construction stage of a capital project or costs incurred to purchase and develop internal use software during the application development stage are recorded as construction in progress. Leasehold improvements are amortized over the lesser of the life of the leasehold improvements or the lease term. Maintenance and repairs are charged to operations as incurred. Long-lived Assets We evaluate the carrying amount of our long-lived assets whenever events or changes in circumstances indicate that the assets may not be recoverable. An impairment loss would be recognized when estimated future cash flows expected to result from the use of the asset and its eventual disposition are less than the carrying amount of the asset. To date, there have been no such impairment losses. Stock-Based Compensation Expense We account for stock-based compensation expense, including the expense of restricted common stock awards (“RSAs”), grants of restricted stock units (“RSUs”), and stock options that may be settled in shares of our common stock, based on the fair values of the equity instruments issued. The fair value is determined on the measurement date, which is generally the date of grant. The fair value for our RSAs is their intrinsic value, which is the difference between the fair value of the underlying stock at the measurement date and the purchase price. The fair value of our RSUs is the fair value of the underlying stock at the measurement date. The fair value for our stock option awards is determined at the grant date using the Black-Scholes valuation model. For awards with performance-based vesting criteria, we assess the probability of the achievement of the performance conditions at the end of each reporting period and begin to recognize the share-based compensation costs when it becomes probable that the performance conditions will be met. For awards that are subject to both service and performance conditions, no expense is recognized until it is probable that performance conditions will be met. Stock-based compensation expense for awards with time-based vesting criteria is recognized as expense on a straight-line basis over the requisite service period. Stock-based compensation expense for awards with performance and other vesting criteria is recognized as expense under an accelerated graded vesting model. Key assumptions used in the Black-Scholes valuation model used for employee stock awards include: Expected term – We derived the expected term using the “simplified” method (the expected term is determined as the average of the time-to-vesting and the contractual life of the options), as we have limited historical information to develop expectations about future exercise patterns and post vesting employment termination behavior. Expected volatility – Expected volatility is estimated using comparable public companies’ volatility for similar terms. Expected dividend – We have not historically declared or paid dividends to our stockholders and have no plans to pay dividends; therefore, we assumed an expected dividend yield of 0%. Risk-free interest rate – The risk-free interest rate is based on the yield on U.S. Treasury securities with the expected term of the associated award. The fair value of our common stock is based on observable market prices. We account for forfeitures of stock-based awards as they occur. Revenue Recognition At inception, we determine whether contracts are within the scope of Accounting Standards Codification Topic 606 (ASU No. 2014-09), Revenue from Contracts with Customers Performance obligations promised in a contract are identified based on the goods and services that will be transferred to the customer that are both capable of being distinct and are distinct in the context of the contract. To the extent a contract includes multiple promised goods and services, we apply judgment to determine whether promised goods and services are both capable of being distinct and distinct in the context of the contract. If these criteria are not met, the promised goods and services are accounted for as a combined performance obligation. The transaction price is determined based on the consideration to which we will be entitled in exchange for transferring goods and services to the customer. To the extent the transaction price includes variable consideration, we estimate the amount of variable consideration that should be included in the transaction price utilizing either the expected value method or the most likely amount method, depending on the nature of the variable consideration. Variable consideration is included in the transaction price if, in our judgment, it is probable that a significant future reversal of cumulative revenue under the contract will not occur. Any estimates, including the effect of the constraint on variable consideration, are evaluated at each reporting period for any changes. Determining the transaction price requires significant judgment, which is discussed in further detail for our research and license agreement in Note 7. Our research and license agreement did not contain a significant financing component. If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation on a relative standalone selling price basis unless the transaction price is variable and meets the criteria to be allocated entirely to a performance obligation or to a distinct service that forms part of a single performance obligation. The consideration to be received is allocated among the separate performance obligations based on relative standalone selling prices. We typically determine standalone selling prices using an adjusted market assessment approach model. We satisfy performance obligations either over time or at a point in time. Revenue is recognized over time if either (i) the customer simultaneously receives and consumes the benefits provided by our performance, (ii) our performance creates or enhances an asset that the customer controls as the asset is created or enhanced or (iii) our performance does not create an asset with an alternative use to the entity and we have an enforceable right to payment for performance completed to date. If we do not satisfy a performance obligation over time, the related performance obligation is satisfied at a point in time by transferring control of a promised good or service to a customer. We evaluate the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition. As of December 31, 2020 , our deferred revenue is related to the Bayer License Agreement, which is within the scope of ASC 606. A s discussed in further detail in Note 7 , the terms of this arrangement include potential payments to us for the following: nonrefundable, upfront fees; development, regulatory, and commercial milestone payments; research and development funding payments; and royalties on the net sales of licensed products. T hese payments relate to promised goods or services for which revenue will be recognized upon our satisfaction of the underlying performance obligations . Licenses of intellectual property Milestone payments Royalties We receive payments from our customer based on billing schedules established in each contract. Our contract liabilities consist of deferred revenue. Upfront payments and fees are recorded as deferred revenue upon receipt or when due and may require deferral of revenue recognition to a future period until the we have satisfied our obligations under these arrangements. Certain judgments affect the application of our revenue recognition policy. For example, we record short-term and long-term deferred revenue based on our best estimate of when such revenue will be recognized. Short-term deferred revenue consists of amounts that are expected to be recognized as revenue in the next 12 months, and long-term deferred revenue consists of amounts that we do not expect will be recognized in the next 12 months. This estimate is based on our current operating plan and, if our operating plan should change in the future, we may recognize a different amount of deferred revenue over the next 12-month period. Contract Balances Customer payments are recorded as deferred revenue upon receipt or when invoiced and may require deferral of revenue recognition to a future period until we satisfy its performance obligations under these arrangements. Amounts payable to us are recorded as accounts receivable when our right to consideration is unconditional. Research and Development Expense Research and development expense consists of costs incurred in performing research and development activities, including compensation and benefits for research and development employees, including stock-based compensation; expenses incurred under agreements with contract research organizations and investigative sites that conduct clinical and preclinical studies; the costs of acquiring and manufacturing clinical study materials and other supplies; payments under licensing and research and development agreements; other outside services and consulting costs, and facilities, information technology and overhead expenses. Research and development costs are expensed as incurred. Clinical Study Accruals Costs for preclinical studies, clinical studies and manufacturing activities are recognized based on an evaluation of our vendors’ progress towards completion of specific tasks, using data such as patient enrollment, clinical site activations or information provided to us by our vendors regarding their actual costs incurred. Payments for these activities are based on the terms of individual contracts and payment timing may differ significantly from the period in which the services are performed. We determine accrual estimates through reports from and discussions with applicable personnel and outside service providers as to the progress or state of completion of studies, or the services completed. Our estimates of accrued expenses as of each balance sheet date are based on the facts and circumstances known at the time. Costs that are paid in advance of performance are deferred as a prepaid expense and amortized over the service period as the services are provided. Defined Contribution Plan We have one qualified 401(k) plan covering all eligible employees. Under the plan, employees may contribute up to the statutory allowable amount for any calendar year. Beginning in 2019, we make matching contributions, equal to 50% of each dollar contributed up to the first 6% of an individual’s eligible earnings, up to the annual IRS maximum. For the years ended December 31, 2020 and 2019, we recorded matching contributions of approximately $2.1 million and $1.6 million, respectively. Other Current Liabilities Other current liabilities consisted of the following as of each period end: December 31, December 31, 2020 2019 (in thousands) Accrued operating expenses $ 3,016 $ 3,900 Current portion of operating lease liabilities 1,730 1,312 Current portion of finance lease liabilities 255 269 Other accrued liabilities 1,056 252 Total other current liabilities $ 6,057 $ 5,733 Income Taxes We use the asset and liability method to account for income taxes. We record deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the tax basis of assets and liabilities using enacted tax rates expected to be in effect when the differences are expected to reverse. Valuation allowances are provided when necessary to reduce net deferred tax assets to the amount that is more likely than not to be realized. Based on the available evidence, we are unable, at this time, to support the determination that it is more likely than not that our deferred tax assets will be utilized in the future. Accordingly, we recorded a full valuation allowance as of December 31, 2020 and 2019. We intend to maintain valuation allowances until sufficient evidence exists to support their reversal. Tax benefits related to uncertain tax positions are recognized when it is more likely than not that a tax position will be sustained during an audit. Interest and penalties related to unrecognized tax benefits are included within the provision for income tax. Comprehensive Income (Loss) Comprehensive income (loss) is defined as a change in equity of a business enterprise during a period resulting from transactions from non-owner sources. Our other comprehensive income (loss) is comprised solely of unrealized gains (losses) on available-for-sale securities and is presented net of taxes. We have not recorded any reclassifications from other comprehensive income (loss) to net loss during any period presented. Recent Accounting Pronouncements The Company considers the applicability and impact of any ASUs issued by the Financial Accounting Standards Board (“FASB”). Other than the ASUs we adopted effective January 1, 2020 and listed below, all other ASUs were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial statements. Adoption of New Accounting Pronouncements We adopted ASU No. 2016-13 (as amended by ASUs 2018-19, 2019-04, 2019-05 and 2019-11), Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments We adopted ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract We adopted ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes |
Net Loss per Common Share
Net Loss per Common Share | 12 Months Ended |
Dec. 31, 2020 | |
Earnings Per Share [Abstract] | |
Net Loss per Common Share | 3. Net Loss per Common Share Basic net loss per common share is calculated by dividing net loss by the weighted-average number of shares of common stock and pre-funded warrants outstanding during the period, without consideration of common share equivalents. Diluted net loss per common share is computed by dividing net loss by the weighted-average number of shares of common stock, pre-funded warrants and common share equivalents outstanding for the period. The pre-funded warrants are included in the computation of basic and diluted net loss per common share as the exercise price is negligible and the pre-funded warrants are fully vested and exercisable. Common share equivalents are only included in the calculation of diluted net loss per common share when their effect is dilutive. Potential dilutive securities, which include unvested restricted stock units (“RSUs”), unvested performance-based RSUs for which established performance criteria have been achieved as of the end of the respective periods, vested and unvested options to purchase common stock and shares to be issued under our employee stock purchase plan (“ESPP”), have been excluded from the computation of diluted net loss per share as the effect is antidilutive. Therefore, the denominator used to calculate both basic and diluted net loss per common share is the same in all periods presented. The following table represents the potential common shares issuable pursuant to outstanding securities as of the related period end dates that were excluded from the computation of diluted net loss per common share, as their inclusion would have an antidilutive effect: As of December 31, 2020 2019 2018 Unvested RSUs 2,868,407 1,910,764 1,405,460 Vested and unvested options 7,832,386 6,934,262 6,276,999 ESPP share purchase rights 26,349 20,438 7,974 Total 10,727,142 8,865,464 7,690,433 |
Financial Instruments
Financial Instruments | 12 Months Ended |
Dec. 31, 2020 | |
Financial Instruments Disclosure [Abstract] | |
Financial Instruments | 4. Financial Instruments The following tables summarize the estimated fair value and related valuation input hierarchy of our available-for-sale securities as of each period end: Total Total Total Total Amortized Unrealized Unrealized Estimated As of December 31, 2020: Input Level Cost Gain Loss Fair Value (in thousands) Money market funds Level 1 $ 168,343 $ — $ — $ 168,343 U.S. Treasury obligations Level 2 230,239 113 (6 ) 230,346 Government agency obligations Level 2 22,537 22 (3 ) 22,556 Corporate debt obligations Level 2 50,080 166 (1 ) 50,245 Commercial paper Level 2 17,990 — — 17,990 Asset-backed securities Level 2 9,860 10 (5 ) 9,865 Total available-for-sale securities 499,049 311 (15 ) 499,345 Less: amounts classified as cash equivalents (199,090 ) — — (199,090 ) Amounts classified as short-term investments $ 299,959 $ 311 $ (15 ) $ 300,255 Total Total Total Total Amortized Unrealized Unrealized Estimated As of December 31, 2019: Input Level Cost Gain Loss Fair Value (in thousands) Money market funds Level 1 $ 63,554 $ — $ — $ 63,554 U.S. Treasury obligations Level 2 52,805 46 (1 ) 52,850 Government agency obligations Level 2 6,151 1 (1 ) 6,151 Corporate debt obligations Level 2 100,512 180 (10 ) 100,682 Commercial paper Level 2 26,290 — — 26,290 Asset-backed securities Level 2 7,266 6 — 7,272 Certificate of deposit Level 2 500 — — 500 Total available-for-sale securities 257,078 233 (12 ) 257,299 Less: amounts classified as cash equivalents (72,507 ) — — (72,507 ) Amounts classified as short-term investments $ 184,571 $ 233 $ (12 ) $ 184,792 The amortized cost and fair value of our available-for-sale securities by contractual maturity were as follows: As of December 31, 2020 As of December 31, 2019 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value (in thousands) (in thousands) Maturing within one year $ 434,828 $ 435,023 $ 214,085 $ 214,199 Maturing in one to five years 64,221 64,322 42,993 43,100 Total available-for-sale securities $ 499,049 $ 499,345 $ 257,078 $ 257,299 As of December 31, 2020, no significant facts or circumstances were present to indicate a deterioration in the creditworthiness of the issuers of the available-for-sale securities we hold, and the Company has no requirement or intention to sell these securities before maturity or recovery of their amortized cost basis. We considered the current and expected future economic and market conditions surrounding the COVID-19 pandemic and determined that our investments were not significantly impacted. For all securities with a fair value less than its amortized cost basis, we determined the decline in fair value below amortized cost basis to be immaterial and non-credit related, and therefore no allowance for losses has been recorded. During the years ended , 2019 and 2018, we did not recognize any impairment losses on our investments. We have elected the practical expedient to exclude the applicable accrued interest from both the fair value and the amortized cost basis of our available-for-sale securities for purposes of identifying and measuring an impairment. We present accrued interest receivable related to our available-for-sale securities in prepaid expenses and other current assets, separate from short-term investments on our consolidated balance sheet. As of December 31, 2020 and 2019, accrued interest receivable was $0.7 million and $0.9 million, respectively. Our accounting policy is to not measure an allowance for credit losses for accrued interest receivables and to write-off any uncollectible accrued interest receivable as a reversal of interest income in a timely manner, which we consider to be in the period in which we determine the accrued interest will not be collected by us. We have not written off any accrued interest receivables for the years ended December 31, 2020, 2019 and 2018. In addition, restricted cash collateralized by money market funds is a financial asset measured at fair value and is a Level 1 financial instrument under the fair value hierarchy. As of December 31, 2020 and 2019, restricted cash totaled $1.4 million. The following table provides a reconciliation of cash, cash equivalents and restricted cash within the consolidated balance sheets that sum to the total of the same such amounts in the consolidated statement of cash flows: December 31, December 31, 2020 2019 (in thousands) Cash and cash equivalents $ 200,404 $ 74,317 Restricted cash - short-term 194 194 Restricted cash - long-term 1,200 1,200 Total cash, cash equivalents and restricted cash $ 201,798 $ 75,711 |
Property and Equipment
Property and Equipment | 12 Months Ended |
Dec. 31, 2020 | |
Property Plant And Equipment [Abstract] | |
Property and Equipment | 5. Property and Equipment Property and equipment consisted of the following as of each period end: December 31, December 31, 2020 2019 (in thousands) Leasehold improvements $ 50,132 $ 49,028 Lab equipment 8,033 6,815 Machinery and equipment 5,023 3,832 Computer equipment and software 4,060 3,299 Furniture and fixtures 2,066 1,764 Construction in progress 879 1,116 Property and equipment, gross 70,193 65,854 Less: accumulated depreciation and amortization (19,676 ) (11,678 ) Property and equipment, net $ 50,517 $ 54,176 Depreciation and amortization expense was $8.3 million, $7.1 million and $3.7 million for the years ended December 31, 2020 , 2019 and 2018 |
License, Collaboration and Manu
License, Collaboration and Manufacturing Agreements | 12 Months Ended |
Dec. 31, 2020 | |
License Collaboration And Manufacturing Agreements [Abstract] | |
License, Collaboration and Manufacturing Agreements | 6. License, Collaboration and Manufacturing Agreements MSK Agreements – In June 2015, we entered into an exclusive license agreement with MSK for three clinical stage T-cell therapies. We are required to make payments of up to $33.0 million to MSK based on achievement of specified regulatory and sales-related milestones, as well as mid-single-digit percentage tiered royalty payments based on future sales of products resulting from the development of the licensed product candidates, if any. In addition, under certain circumstances, we are required to make certain minimum annual royalty payments to MSK, which are creditable against earned royalties owed for the same annual period. We are also required to pay a low double-digit percentage of any consideration we receive for sublicensing the licensed rights. The license agreement expires on a product-by-product and country-by-country basis on the latest of: (i) expiration of the last licensed patent rights related to each licensed product, (ii) expiration of any market exclusivity period granted by law with respect to each licensed product, and (iii) a specified number of years after the first commercial sale of the licensed product in each country. Upon expiration of the license agreement, Atara will retain non-exclusive rights to the licensed products. In May and December 2018, we licensed additional technology from MSK. In connection with the effectiveness of the December 2018 license agreement, we made upfront cash payments of $12.5 million in first quarter of 2019, which were recorded as research and development expense in our consolidated statement of operations and comprehensive loss in the fourth quarter of 2018. We are obligated to make additional milestone payments based on achievement of specified development, regulatory and sales-related milestones as well as mid-single-digit percentage tiered royalty payments based on future sales of products resulting from the development of the licensed product candidates, if any. QIMR Berghofer Agreements – In October 2015, we entered into an exclusive license agreement and a research and development collaboration agreement with QIMR Berghofer. Under the terms of the license agreement, we obtained an exclusive, worldwide license to develop and commercialize allogeneic T-cell therapy programs utilizing technology and know-how developed by QIMR Berghofer. In September 2016, the exclusive license agreement and research and development collaboration agreement were amended and restated. Under the amended and restated agreements, we obtained an exclusive, worldwide license to develop and commercialize additional T-cell programs, as well as the option to license additional technology that we exercised in June 2018. We further amended and restated our license agreement and research and development collaboration agreements with QIMR Berghofer in August 2019 to terminate our license to certain rights related to cytomegalovirus and again in August 2020 to terminate our license to certain rights related to BK polyomavirus and JC polyomavirus. Our current license agreement also provides for various milestone and royalty payments to QIMR Berghofer based on future product sales, if any. Under the terms of our current research and development collaboration agreement, we are also required to reimburse the cost of agreed-upon development activities related to programs developed under the collaboration. These payments are expensed on a straight-line basis over the related development periods. The agreement also provides for various milestone payments to QIMR Berghofer based on achievement of certain developmental and regulatory milestones. From time to time, we have entered into other license and collaboration agreements with other parties. For example, we licensed additional rights related to our MSK-partnered next-generation CAR T programs from MSK in May 2018 and we licensed rights related to our next-generation CAR T programs from Moffitt Cancer Center in August 2018, and we agreed to collaborate through sponsored research in connection with each of these licenses. We also licensed rights related to our MSK-partnered next-generation CAR T programs from the National Institutes of Health in December 2018. Milestones and royalties under each of the above agreements are contingent upon future events and will be recorded as expense when it is probable that the milestones will be achieved or royalties are due. As of December 31, 2020 and 2019, there were no outstanding obligations for milestones and royalties under our license and collaboration agreements. Cognate Agreement In December 2019, we entered into a Commercial Manufacturing Services Agreement (the “Manufacturing Agreement”) with Cognate Bioservices, Inc. (“Cognate”). Pursuant to the Manufacturing Agreement, Cognate provides manufacturing services for certain of our product candidates. The initial term of the Manufacturing Agreement is from January 1, 2020 until December 31, 2021 and is renewable with Cognate’s approval for an additional one-year period. We may terminate the Manufacturing Agreement for convenience on six months’ written notice to Cognate, or immediately if Cognate is unable to perform the services under the Manufacturing Agreement or fails to obtain or maintain certain necessary approvals. |
Research, Development and Licen
Research, Development and License Agreement | 12 Months Ended |
Dec. 31, 2020 | |
Research And Development [Abstract] | |
Research, Development and License Agreement | 7. Research, Development and License Agreement In December 2020, we entered into the Bayer License Agreement to develop mesothelin-directed CAR T-cell therapies for the treatment of solid tumors, pursuant to which we granted to Bayer an exclusive, field-limited license under the applicable patents and know-how owned or controlled by us and our affiliates covering or related to ATA2271 and ATA3271 (the “Licensed Products”). Under the terms of the Bayer License Agreement, we will be responsible at our cost for all mutually agreed preclinical and clinical activities for ATA2271 through the first in human Phase 1 clinical study in collaboration with MSK, following which Bayer will be responsible for the further development of ATA2271 at its cost. Bayer will be responsible for the development of ATA3271, except for certain mutually agreed preclinical, translational, manufacturing and supply chain activities to be performed by us relating to ATA3271, in each case at Bayer’s cost. Bayer will also be solely responsible for commercializing the Licensed Products at its cost. In December 2020, we received an upfront cash payment of $45.0 million from Bayer for the exclusive license grant, net of applicable withholding taxes, which we believe are recoverable, and an additional $15.0 million upfront reimbursement payment for certain research and process development activities to be performed by us. We are also entitled to receive (i) up to an additional $5.0 million for additional, specified translational activities under the Bayer License Agreement, of which we have invoiced $1.3 million, and (ii) an aggregate of up to $610.0 million in milestone payments upon achieving certain development, regulatory and commercial milestones relating to the Licensed Products. In addition, we are eligible to receive from Bayer tiered royalties at percentages up to low double digits on worldwide net product sales of the Licensed Products on a country-by-country and product-by-product basis until the later of 12 years after the first commercial sale in such country or the expiration of specified patent rights in such country, subject to certain reductions and aggregate minimum floors. We will negotiate a separate manufacturing and supply agreement with Bayer for us to manufacture allogeneic mesothelin-directed CAR T-cell therapies for Bayer to use in clinical trials at a price based on our costs plus a margin, which is consistent with our standalone selling price. Bayer and we have formed a joint steering committee (“JSC”) that will provide oversight, decision making and implementation guidance regarding the collaboration activities covered under the agreement. We assessed this arrangement in accordance with ASC 606 and concluded that the promises in the Bayer License Agreement represent transactions with a customer. We concluded that the Bayer License Agreement contains the following promises: (i) a development and commercialization license; (ii) performance of early-stage research and development (“R&D”) services, including technology transfer services; (iii) JSC participation; and (iv) chemistry, manufacturing and control (“CMC”) services. In accordance with ASC 606, we determined that the license, early-stage R&D and CMC services were not distinct from each other, as the license, early-stage R&D and CMC services are highly interdependent upon one another. Participation on the JSC to oversee the research and development activities are combined into the single performance obligation as these activities are highly interdependent with the other R&D and CMC services. Accordingly, we determined that these promises should be combined into a single performance obligation. Under the Bayer License Agreement, in order to evaluate the appropriate transaction price, we determined that the $45.0 million upfront payment for the license, $15.0 million for certain research and process development activities and the $5.0 million for additional specified translational activities, to be billed based on certain criteria being met, constituted the entire consideration to be included in the transaction price at the outset of the arrangement, and this amount was allocated to the single performance obligation. The potential development and commercial milestone payments that we are eligible to receive were excluded from the transaction price, as all milestone amounts were fully constrained based on the probability of achievement. None of the future royalty and sales-based milestone payments were included in the transaction price, as the potential payments represent sales-based consideration. We will reevaluate the transaction price at the end of each reporting period and as uncertain events are resolved or other changes in circumstances occur, and, if necessary, adjust our estimate of the transaction price. We will utilize a cost-based input method to measure its progress toward completion of its performance obligation and to calculate the corresponding amount of revenue to recognize each period, as we determined the cost-based input method to be the best measure of progress, as other measures do not reflect how we transfer our performance obligation to Bayer. In applying the cost-based input method of revenue recognition, revenue will be recognized based on the amount of actual costs incurred relative to the total budgeted costs expected to be incurred for the combined performance obligation. A cost-based input method of revenue recognition requires us to make estimates of costs to complete our performance obligation. In making such estimates, significant judgment is required to evaluate assumptions related to cost estimates. The cumulative effect of revisions to estimated costs to complete our performance obligation will be recorded in the period in which changes are identified and amounts can be reasonably estimated. Revenue associated with the combined performance obligation is being recognized over the initial estimated contract term of three years. The transfer of control occurs over this time period and, in our judgment, is the best measure of progress towards satisfying the performance obligation. A significant change in these assumptions and estimates could have a material impact on the timing and amount of revenue recognized in future periods. During the year ended December 31, 2020, we did not recognize any revenue under Bayer License Agreement. Deferred revenue related to the agreement with Bayer amounted to $61.3 million as of December 31, 2020, of which $33.5 million is included in current liabilities and $27.8 million is included in long-term liabilities, is expected to be recognized over the next three years. No development or sales-based milestone payments were received during the year ended December 31, 2020. |
Leases
Leases | 12 Months Ended |
Dec. 31, 2020 | |
Leases [Abstract] | |
Leases | 8 . Leases We lease our corporate headquarters in South San Francisco, California under a non-cancellable lease agreement that expires in May 2022 February 2026 April 2024 In February 2017, we entered into a lease agreement for approximately 90,580 square feet of office, lab and cellular therapy manufacturing space in Thousand Oaks, California. The initial 15-year term of the lease commenced on February 15, 2018, upon the substantial completion of landlord’s work as defined under the agreement. The contractual obligations during the initial term are $16.4 million in aggregate. Based on the terms of the lease agreement and on our involvement in certain aspects of the construction, we were deemed the owner of the building during the construction period in accordance with U.S. GAAP in effect prior to January 1, 2019. Under this build-to-suit lease arrangement, we recognized construction in progress based on all construction costs incurred by both us and the landlord. We also recognized a financing obligation equal to all costs funded by the landlord. Due to completion of the construction by the landlord and not having met the criteria for sale-lease back accounting, we transferred the $10.3 million of landlord’s construction costs previously capitalized as construction in progress to a build-to-suit asset, and recognized a corresponding long-term financing obligation for the same amount in long-term liabilities in our consolidated balance sheets. In addition, we recorded $0.3 million of capitalized interest during the construction period through December 31, 2018. A portion of the monthly lease payment was allocated to land rent and recorded as an operating lease expense and the non-interest portion of the amortized lease payments to the landlord related to rent of the building was applied to the lease financing liability. Further, we recorded ground lease expense of $0.4 million for the year ended December 31, 2018 in our consolidated statement of operations and comprehensive loss, representing the estimated cost of renting the land during the construction period. Due to the adoption of ASU No. 2016-02, Leases (Topic 842), no ground lease expense was recognized for the years ended December 31, 2020 and 2019. The maturities of lease liabilities under our operating and finance leases as of December 31, 2020 were as follows: Operating Leases Finance Leases Years Ending December 31, (in thousands) 2021 $ 3,177 $ 282 2022 2,835 130 2023 2,696 29 2024 2,593 — 2025 2,587 — Thereafter 9,300 — Total lease payments $ 23,188 $ 441 Less: amount representing interest (8,417 ) (37 ) Present value of lease liabilities $ 14,771 $ 404 Balance as of December 31, 2020 Other current liabilities $ 1,730 $ 255 Operating lease liabilities - long-term 13,041 — Other long-term liabilities — 149 Total $ 14,771 $ 404 The components of lease cost were as follows: Year Ended Year Ended December 31, 2020 December 31, 2019 (in thousands) Operating lease cost: Operating lease cost $ 3,020 $ 2,578 Short-term lease cost 987 770 Total operating lease cost $ 4,007 $ 3,348 Finance lease cost: Amortization expense $ 389 $ 324 Interest on lease liabilities 60 56 Total finance lease cost $ 449 $ 380 Rent expense under operating leases for the year ended December 31, 2018 was $2.2 million. Other information related to leases was as follows: Year Ended Year Ended December 31, 2020 December 31, 2019 (in thousands, except lease term and discount rate) Supplemental Cash Flows Information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 2,878 $ 2,346 Operating cash flows for finance leases 62 50 Financing cash flows for finance leases 389 486 Operating lease assets obtained in exchange for lease obligations: $ — $ 838 Finance lease assets obtained in exchange for lease obligations: 281 323 Non-cash increase to operating lease assets due to remeasurement of lease liabilities: 639 — Weighted Average Remaining Lease Term Operating leases 9.4 years 10.3 years Finance leases 1.7 years 2.5 years Weighted Average Discount Rate Operating leases 10.3 % 10.4 % Finance leases 9.7 % 10.0 % Asset Retirement Obligation The Company’s ARO consists of a contractual requirement to remove the tenant improvements at our manufacturing facility in Thousand Oaks, California and restore the facility to a condition specified in the lease agreement. The Company records an estimate of the fair value of its ARO in long-term liabilities in the period incurred. The fair value of the ARO is also capitalized in property and equipment, net and depreciated over the lease term. The fair value of our ARO was estimated by discounting projected cash flows over the estimated life of the related assets using our credit adjusted risk-free rate. The following table presents the activity for our ARO liabilities: ARO Liability (In thousands) Balance as of December 31, 2019 $ 788 Accretion expense 78 Balance as of December 31, 2020 $ 866 |
Commitments and Contingencies
Commitments and Contingencies | 12 Months Ended |
Dec. 31, 2020 | |
Commitments And Contingencies Disclosure [Abstract] | |
Commitments and Contingencies | 9 . Commitments and Contingencies License and Collaboration Agreements Potential payments related to our license and collaboration agreements, including milestone and royalty payments, are detailed in Note 6. Other Research and Development Agreements We may enter into contracts in the normal course of business with clinical research organizations for clinical trials, with contract manufacturing clinical supplies, and with other vendors for preclinical studies, supplies and other services for our operating purposes. These contracts generally provide for termination on Indemnification Agreements In the normal course of business, we enter into contracts and agreements that contain a variety of representations and warranties and provide for indemnification for certain liabilities. The exposure under these agreements is unknown because it involves claims that may be made against us in the future but have not yet been made. To date, we have not paid any claims or been required to defend any action related to our indemnification obligations. However, we may record charges in the future as a result of these indemnification obligations. We also have indemnification obligations to our directors and executive officers for specified events or occurrences, subject to some limits, while they are serving at our request in such capacities. There have been no claims to date and we consider the fair value of these indemnification agreements to be minimal. Accordingly, we did not record liabilities for these agreements as of December 31, 2020 and 2019. Contingencies From time to time, we may be involved in legal proceedings, as well as demands, claims and threatened litigation, which arise in the normal course of our business or otherwise. The ultimate outcome of any litigation is uncertain and unfavorable outcomes could have a negative impact on our results of operations and financial condition. Regardless of outcome, litigation can have an adverse impact on us because of the defense costs, diversion of management resources and other factors. We are not currently involved in any material legal proceedings. |
Stockholders' Equity
Stockholders' Equity | 12 Months Ended |
Dec. 31, 2020 | |
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |
Stockholders' Equity | 10 . Stockholders’ Equity Our authorized capital stock consists of 520,000,000 shares, all with a par value of $0.0001 per share, of which 500,000,000 shares are designated as common stock and 20,000,000 shares are designated as preferred stock. There were no shares of preferred stock outstanding as of . Equity Offerings In January 2018, we completed an underwritten public offering of 7,675,072 shares of common stock at an offering price of $18.25 per share and received net proceeds of $131.4 million, after deducting underwriting discounts and commissions and offering expenses payable by us. Further, in March 2018, we completed an underwritten public offering of 4,928,571 shares of common stock at an offering price of $35.00 per share and received net proceeds of $161.9 million, after deducting underwriting discounts and commissions and offering expenses payable by us. In July 2019, we issued and sold 6,871,727 shares of common stock at a public offering price of $15.28 per share and pre-funded warrants to purchase 2,945,026 shares of common stock at an offering price of $15.2799 per warrant in an underwritten public offering pursuant to a shelf registration on Form S-3. The gross proceeds from this public offering were $150.0 million, resulting in aggregate net proceeds of $140.7 million, after deducting underwriting discounts and commissions and offering expenses payable by us. Each pre-funded warrant entitles the holder to purchase one share of common stock at an exercise price of $0.0001 per share and expires seven years from the date of issuance. These warrants were recorded as a component of stockholders’ equity within additional paid-in capital. Per the terms of the warrant agreement, a holder of the outstanding warrants is not entitled to exercise any portion of any pre-funded warrant if, upon exercise of the warrant, the holder’s ownership (together with its affiliates) of our common stock or combined voting power of our securities beneficially owned by such holder (together with its affiliates) would exceed 9.99% after giving effect to the exercise (“Maximum Ownership Percentage”). Upon at least 61 days’ prior notice to us by the holder, any holder may increase or decrease the Maximum Ownership Percentage to any other percentage not to exceed 19.99%. As of December 31, 2020, 2,888,526 of the pre-funded warrants from the July 2019 underwritten public offering were outstanding. In the second quarter of 2020, we issued and sold 12,633,039 shares of common stock at a public offering price of $11.32 per share and pre-funded warrants to purchase 2,866,961 shares of common stock at a public offering price of $11.3199 per warrant in an underwritten public offering pursuant to a shelf registration on Form S-3. We granted the underwriters an option to purchase up to 2,325,000 additional shares of our common stock at a public offering price of $11.32, less underwriting discounts and commissions. The full option was exercised by the underwriters in June 2020. The gross proceeds from this public offering were $201.8 million, resulting in net proceeds of $189.3 million, after deducting underwriting discounts and commissions and offering expenses payable by us. The terms of the pre-funded warrants issued and sold as part of this public offering were similar to those above. In December 2020, we issued and sold 5,102,041 shares of common stock at a public offering price of $24.50 per share and pre-funded warrants to purchase 2,040,816 shares of common stock at a public offering price of $24.4999 per warrant in an underwritten public offering pursuant to a shelf registration on Form S-3. The gross proceeds from this public offering were $175.0 million, resulting in net proceeds of $164.3 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by us. As of December 31, 2020, all of the pre-funded warrants issued and sold as part of the 2020 underwritten public offerings were outstanding. ATM Facilities In March 2017, we entered into a sales agreement (the “2017 ATM Facility”) with Cowen and Company, LLC (“Cowen”), which provided for the sale, in our sole discretion, of shares of our common stock, in the aggregate offering price of up to $75.0 million through Cowen, as our sales agent. In February 2019, we terminated the 2017 ATM Facility and entered into a new sales agreement (the “2019 ATM Facility”) with Cowen, which provided for the sale, in our sole discretion, of shares of our common stock having an aggregate offering price of up to $100.0 million through Cowen, as our sales agent. In February 2020, we entered into a new sales agreement (the “2020 ATM Facility”) with Cowen, which provides for the sale, in our sole discretion, of shares of our common stock having an aggregate offering price of up to $100.0 million through Cowen, as our sales agent. The 2020 ATM Facility is separate from and does not replace the 2019 ATM Facility in any way. We pay a commission of up to 3.0% of gross sales proceeds of any common stock sold under the 2020 ATM Facility. During the fiscal year ended December 31, 2020 December 31, 2019 The issuance and sale of these shares by us pursuant to the ATM facilities are deemed “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, as amended (the “Securities Act”), and are registered under the Securities Act. As of December 31, 2020 fully utilized the 2019 ATM Facility, and remained available to be sold under the 2020 ATM Facility, subject to certain conditions as specified in the agreement Equity Incentive Plans In March 2014, we adopted the 2014 Equity Incentive Plan (“2014 EIP”), which was amended and restated on October 15, 2014 upon the pricing of our initial public offering (“IPO”). The 2014 EIP provides for annual increases in the number of shares available for issuance thereunder on the first business day of each fiscal year, beginning with 2015 and ending in 2024, equal to five percent of the number of shares of the Company’s common stock outstanding as of such date or a lesser number of shares as determined by our board of directors. Under the terms of the 2014 EIP, we may grant stock options, RSAs and RSUs to employees, directors, consultants and other service providers. RSUs generally vest over four years. In 2020, we granted performance-based awards to certain of our employees that provide for the issuance of common stock if specified Company performance criteria related to our clinical programs are achieved. The number of performance-based awards that ultimately vests depends upon if, when and which performance criteria are achieved, as well as the employee’s continuous service, as defined in the 2014 EIP, through the date of vesting. The fair value of RSUs, including those with performance conditions, is determined as the closing stock price on the date of grant. Stock options are granted at prices no less than 100% of the estimated fair value of the shares on the date of grant as determined by the board of directors, provided, however, that the exercise price of an option granted to a 10% shareholder cannot be less than 110% of the estimated fair value of the shares on the date of grant. Options granted generally vest over four years and expire in seven to ten years. As of December 31, 2020 In February 2018, we adopted the 2018 Inducement Plan (“Inducement Plan”), under which we may grant options, stock appreciation rights, RSAs and RSUs to new employees. In September 2020, we amended the Inducement Plan to reserve an additional 1,500,000 shares of the Company’s common stock for issuance under the Inducement Plan, as amended. As of December 31, 2020 Restricted Stock Units The weighted average grant date fair value of RSUs granted during the years ended December 31, 2020 December 31, 2020 December 31, 2020 December 31, 2020 The following is a summary of RSU activity under our 2014 EIP and Inducement Plan: RSUs Shares Weighted Average Grant Date Fair Value Balance as of December 31, 2019 1,910,764 $ 26.93 Granted 3,973,991 $ 12.19 Forfeited (836,190 ) $ 18.39 Vested (1,218,945 ) $ 19.34 Balance as of December 31, 2020 3,829,620 $ 15.91 Under our RSU settlement procedures, for some of the RSUs granted to our employees, we withhold shares at settlement to cover the estimated payroll withholding tax obligations. During 2020, we settled 1,218,945 shares underlying RSUs, of which 276,822 shares underlying RSUs were net settled by withholding 106,459 shares. The value of the shares underlying RSUs withheld was $1.5 million, based on the closing price of our common stock on the settlement date. During 2019, we settled 574,168 shares underlying RSUs, of which 488,964 shares underlying RSUs were net settled by withholding 212,879 shares. The value of the shares underlying RSUs withheld was $6.7 million, based on the closing price of our common stock on the settlement date. The value of RSUs withheld in each period was remitted to the appropriate taxing authorities and has been reflected as a financing activity in our consolidated statements of cash flows. Stock Options The following is a summary of stock option activity under our 2014 EIP and Inducement Plan. The table below also includes the activity relating to options for 275,000 shares of our common stock which were issued in 2017 outside of these plans: Shares Weighted Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Balance as of December 31, 2019 6,934,262 $ 28.25 5.9 $ 4,103 Granted 2,641,125 12.01 Exercised (268,938 ) 14.75 Forfeited or expired (1,454,563 ) 30.17 Balance as of December 31, 2020 7,851,886 $ 22.89 6.4 $ 26,834 Vested and expected to vest as of December 31, 2020 7,851,886 $ 22.89 6.4 $ 26,834 Exercisable as of December 31, 2020 3,747,718 $ 26.74 4.5 $ 6,214 Aggregate intrinsic value represents the difference between the closing stock price of our common stock on December 31, 2020 December 31, 2020 Options for 268,938, 347,716 and 1,051,180 shares of our common stock were exercised during the years ended December 31, 2020 The fair value of each option issued was estimated at the date of grant using the Black-Scholes valuation model. The following table summarizes the weighted-average assumptions used as inputs to the Black-Scholes model and resulting weighted-average grant date fair values of stock options granted during the periods indicated: Year ended December 31, 2020 2019 2018 Assumptions: Expected term (years) 6.0 5.9 4.6 Expected volatility 76.8 % 76.1 % 73.5 % Risk-free interest rate 0.8 % 2.1 % 2.7 % Expected dividend yield 0.0 % 0.0 % 0.0 % Fair Value: Weighted-average estimated grant date fair value per share $ 7.96 $ 18.06 $ 22.96 Options granted 2,641,125 2,535,425 2,998,650 Total estimated grant date fair value $ 21,023,000 $ 45,790,000 $ 68,849,000 The estimated fair value of stock options that vested in the years ended December 31, 2020 Employee Stock Purchase Plan In May 2014, we adopted the 2014 Employee Stock Purchase Plan (“2014 ESPP”), which became effective on October 15, 2014 upon the pricing of our IPO. The 2014 ESPP permits eligible employees to purchase common stock at a discount through payroll deductions during defined offering periods. Eligible employees can purchase shares of the Company’s common stock at 85% of the lower of the fair market value of the common stock at (i) the beginning of a 12-month offering period, or (ii) at the end of one of the two related 6-month purchase periods. No participant in the 2014 ESPP may purchase shares of common stock valued at more than $25,000 per calendar year. The first offering under the 2014 ESPP commenced on June 1, 2016, and subsequent offerings commence on each anniversary of this date. The Company recorded $1.8 million, $1.3 million and $1.2 million of expense related to the 2014 ESPP in the years ended December 31, 2020, December 31, 2020 As of December 31, 2020, there was $0.6 million of unrecognized stock-based compensation expense related to the ESPP that is expected to be recognized by the end of second quarter of 2021. The 2014 ESPP provides for annual increases in the number of shares available for issuance thereunder on the first business day of each fiscal year, beginning with 2015 and ending in 2024, equal to the lower of (i) one percent of the number of shares of our common stock outstanding as of such date, (ii) 230,769 shares of our common stock, or (iii) a lesser number of shares as determined by our board of directors. As of December 31, 2020, there were 1,586,742 shares authorized under the 2014 ESPP. Reserved Shares The following shares of common stock were reserved for future issuance under our equity incentive plans as of December 31, 2020 Total Shares Reserved 2014 Equity Incentive Plan 13,545,106 2018 Inducement Plan 2,634,836 2014 Employee Stock Purchase Plan 950,803 Total reserved shares of common stock 17,130,745 Stock-based Compensation Expense Total stock-based compensation expense related to all stock awards was as follows: Year Ended December 31, 2020 2019 2018 (in thousands) Research and development $ 31,527 $ 26,773 $ 16,211 General and administrative 19,824 24,923 17,606 Total stock-based compensation expense $ 51,351 $ 51,696 $ 33,817 |
Income Taxes
Income Taxes | 12 Months Ended |
Dec. 31, 2020 | |
Income Tax Disclosure [Abstract] | |
Income Taxes | 1 1 . Income Taxes Losses before provision for income taxes were as follows in each period presented: Year Ended December 31, 2020 2019 2018 (in thousands) United States $ (306,758 ) $ (291,049 ) $ (230,765 ) Foreign 153 85 22 Total loss before provision for income taxes $ (306,605 ) $ (290,964 ) $ (230,743 ) The Company liquidated its Cayman Islands entity in 2018 and elected to treat the entity as disregarded for the fiscal year 2018. As such, the applicable 2018 losses are treated as losses in the United States. The components of provision for (benefit from) income taxes were as follows in each period presented: Year Ended December 31, 2020 2019 2018 (in thousands) Current provision for (benefit from) income taxes: Federal $ — $ — $ (31 ) State 2 — (15 ) Foreign 13 12 2 Total current provision for (benefit from) income taxes $ 15 $ 12 $ (44 ) A reconciliation of statutory tax rates to effective tax rates were as follows in each of the periods presented: Year Ended December 31, 2020 2019 2018 Federal income taxes at statutory rate 21.0 % 21.0 % 21.0 % Impact of stock compensation (2.4 %) 0.1 % — Non-deductible executive compensation (0.1 %) (0.7 %) (0.7 %) Capitalized research — — 7.8 % Other 0.3 % (0.2 %) (0.6 %) Change in valuation allowance (18.8 %) (20.2 %) (27.5 %) Effective tax rate 0.0 % 0.0 % 0.0 % Deferred tax assets and liabilities reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets and liabilities were as follows for each of the dates presented: As of December 31, 2020 2019 (in thousands) Deferred tax assets: Net operating losses $ 237,010 $ 162,436 Stock-based compensation 20,672 17,573 Capitalized expenses 12,590 14,129 License fees 8,159 6,870 Operating lease liabilities 4,251 4,325 Legal fees 2,136 1,683 Tax credits 1,580 — Other 5,360 3,329 Total deferred tax assets 291,758 210,345 Valuation allowance (287,349 ) (205,249 ) Total deferred tax assets 4,409 5,096 Deferred tax liabilities: Operating lease assets (3,541 ) (3,921 ) Other (868 ) (1,175 ) Total deferred tax liabilities (4,409 ) (5,096 ) Net deferred tax assets (liabilities) $ — $ — We recognize deferred income taxes for temporary differences between the basis of assets and liabilities for financial statement and income tax purposes, as well as for tax attribute carryforwards. We regularly evaluate the positive and negative evidence in determining the realizability of our deferred tax assets. Based upon the weight of available evidence, which includes our historical operating performance and reported cumulative net losses since inception, we maintained a full valuation allowance on the net deferred tax assets as of December 31, 2020 December 31, 2020 In response to the COVID-19 pandemic, the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was signed into law on March 27, 2020, providing companies with various tax relief provisions and other stimulus measures. Such measures include, but are not limited to, temporary changes regarding the prior and future utilization of net operating losses, technical corrections to prior tax legislation for tax depreciation of certain qualified improvement property, acceleration of AMT credit refunds, and changes to business interest limitations. The Consolidated Appropriations Act was also signed into law on December 27, 2020 to provide further relief measures and renew various expiring tax provisions. Additionally, the IRS issued final regulations and proposed regulations on calculating the limitation on business interest expense, the allowance for the first-year depreciation deduction under IRC Section 168(k), as amended by the Tax Cuts and Jobs Act (the “Tax Act”), for qualified property acquired and placed in service after September 27, 2017, and meals and entertainment deductions. Based on our evaluation, these regulations did not have a material impact on the income tax provision for the years ended December 31, 2020, 2019 and 2018. Under the Tax Act, as modified by the CARES Act, federal net operating losses generated in tax years beginning on or after January 1, 2018 and in future years may be carried forward indefinitely, but the utilization of such federal net operating losses arising in taxable years beginning on or after January 1, 2021 is limited to 80% of a tax year’s taxable income. The CARES Act temporarily suspends this 80% taxable income limitation, allowing a net operating loss carryforward to fully offset taxable income in tax years beginning before January 1, 2021. Not all states conform to the Tax Act or CARES Act and some states have varying conformity to the Tax Act or CARES Act. As of December 31, 2020 As of December 31, 2020, we had federal research & development and orphan drug tax credits of $12.9 million and $75.1 million, respectively, to offset future taxes payable. These federal credits begin to expire in 2032 and 2035, respectively, if not utilized. As of December 31, 2020, we had California research & development tax credits of $21.6 million, which do not expire, to offset future taxes payable. Under Section 382 of the Internal Revenue Code of 1986, as amended, our ability to utilize net operating loss carryforwards or other tax attributes in any taxable year may be limited if we have experienced an “ownership change.” Generally, a Section 382 “ownership change” occurs if one or more stockholders or groups of stockholders who owns at least 5% of a corporation’s stock increases its ownership by more than 50 percentage points over its lowest ownership percentage within a specified testing period. Similar rules may apply under state tax laws. We have completed a Section 382 study of transactions in our stock through December 31, 2020. The study concluded that we have experienced ownership changes since inception and that our utilization of net operating loss carryforwards will be subject to annual limitations. However, it is not expected that the annual limitations will result in the expiration of tax attribute carryforwards prior to utilization . The changes in the balance of gross unrecognized tax benefits, which excludes interest and penalties, for the years ended December 31, 2018, 2019 and 2020 are as follows: (In thousands) Balance as of January 1, 2018 $ 30,051 Gross increases for tax positions related to current year 12,927 Gross increases for tax positions related to prior year 704 Gross decreases for tax positions related to prior year (2,608 ) Balance as of December 31, 2018 41,074 Gross increases for tax positions related to current year 22,800 Gross increases for tax positions related to prior year 22,126 Gross decreases for tax positions related to prior year — Balance as of December 31, 2019 86,000 Gross increases for tax positions related to current year 24,648 Gross increases for tax positions related to prior year — Gross decreases for tax positions related to prior year (47 ) Balance as of December 31, 2020 $ 110,601 The Company currently has a full valuation allowance against its U.S. net deferred tax assets, which would impact the timing of the effective tax rate benefit should any uncertain tax position be favorably settled in the future. Of the $110.6 million total unrecognized tax benefits as of December 31, 2020 The Company’s policy is to account for interest and penalties related to uncertain tax positions as a component of the income tax provision. The Company has not accrued interest and penalties as of December 31, 2020 and 2019 due to available tax losses. Our significant jurisdictions are the U.S. federal jurisdiction and the California state jurisdiction. All of our tax years remain open to examination by the U.S. federal and California tax authorities. We also file in other state, local and foreign jurisdictions in which we operate, and such tax years remain open to examination. As of December 31, 2020, we are permanently reinvested with respect to our foreign earnings, which are not material as our foreign operations are not significant. |
Summary of Significant Accoun_2
Summary of Significant Accounting Policies (Policies) | 12 Months Ended |
Dec. 31, 2020 | |
Accounting Policies [Abstract] | |
Basis of Presentation | Basis of Presentation We prepare our consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and follow the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). |
Principles of Consolidation | Principles of Consolidation The consolidated financial statements include the accounts of Atara and our wholly owned subsidiaries. All intercompany balances and transactions are eliminated in consolidation. |
Segment and Geographic Information | Segment and Geographic Information We operate and manage our business as one operating and reportable segment, which is the business of developing and commercializing therapeutics. Our Chief Executive Officer, who is our chief operating decision maker, reviews financial information on an aggregate basis for purposes of allocating resources and evaluating financial performance. Substantially all of our assets are located in the U.S. |
Liquidity Risk | Liquidity Risk We have incurred significant operating losses since inception and have relied primarily on public and private equity financings to fund our operations. As we continue to incur losses, our transition to profitability will depend on the successful development, approval and commercialization of product candidates and on the achievement of sufficient revenues to support our cost structure. We may never achieve profitability, and unless and until we do, we will need to continue to raise additional capital. We expect that existing cash, cash equivalents and short-term investments as of December 31, 2020 will be sufficient to fund our operations for at least the next twelve months from the date of issuance of these financial statements. |
Concentration of Credit Risk and Other Uncertainties | Concentration of Credit Risk and Other Uncertainties We place cash and cash equivalents in the custody of financial institutions that management believes are of high credit quality, the amount of which at times, may be in excess of the amount insured by the Federal Deposit Insurance Corporation. We also make short-term investments in money market funds; U.S. Treasury, government agency and corporate debt obligations; commercial paper; certificates of deposit; and asset-backed securities, which can be subject to certain credit risk. However, we mitigate the risks by investing in high-grade instruments, limiting our exposure to any one issuer and monitoring the ongoing creditworthiness of the financial institutions and issuers. O ne research, development and license agreement entered into in 2020 accounted for all of the deferred revenue as of December 31, 2020 . For the year ended December 31, 2020 , we did not recognize any revenue from this agreement. Our accounts receivable balance consists of amounts due pursuant to this agreement. We believe the receivable balance is fully collectible. We are subject to certain risks and uncertainties and believe that changes in any of the following areas could have a material adverse effect on future financial position or results of operations: our ability to obtain future financing; regulatory approval and market acceptance of, and reimbursement for, our product candidates, if approved by applicable regulatory authorities; performance of third-party clinical research organizations and manufacturers upon which we rely; development of sales channels; protection of our intellectual property; litigation or claims against us based on intellectual property, patent, product, regulatory or other factors; and our ability to attract and retain employees necessary to support our growth. |
Use of Estimates | Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates, assumptions and judgments that affect the amounts reported in the financial statements and accompanying notes. Significant estimates relied upon in preparing these financial statements include estimates related to revenue recognition, clinical study and other accruals, stock-based compensation expense and income taxes. Actual results could differ materially from those estimates. |
Leases | Leases On January 1, 2019, we adopted Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842) We determine if an arrangement is a lease at inception. Operating leases are included in operating lease assets, other current liabilities, and operating lease liabilities on our consolidated balance sheets. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize short-term lease expense for these leases on a straight-line basis over the lease term. Finance leases are included in other assets, other current liabilities, and other long-term liabilities on our consolidated balance sheets. Lease assets and lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. The lease term includes renewal options that we are reasonably certain of exercising as of the commencement date. None of the lease terms used to calculate the future minimum lease payments at commencement date include renewal options. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The incremental borrowing rate for our leases is determined based on lease term and currency in which lease payments are made, adjusted for impacts of collateral. Lease assets also includes any lease payments made and excludes lease incentives and initial direct costs incurred. Operating lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. Finance lease assets are amortized over the shorter of the lease term or the asset’s estimated useful life. Our facilities and equipment operating leases have lease and non-lease components and we have made a policy election to account for the lease and non-lease components as a single lease component. Through December 31, 2018, the leases were reviewed for classification as operating, capital or build-to-suit leases. For operating leases, rent was recognized on a straight-line basis over the lease period. For capital leases, we recorded the leased asset in property and equipment, net, with the related amortization of the capital lease asset recorded in depreciation expense, and we recorded a corresponding liability for principal and interest. Payments were recorded as reductions to these liabilities with interest being charged to interest expense in our consolidated statements of operations and comprehensive loss. We analyzed the nature of the renovations and our involvement during the construction period of our manufacturing facility and determined that we were the deemed “owner” of the construction project during the construction period. As a result, we were required to capitalize the fair value of the building as well as the construction costs incurred on our consolidated balance sheet along with a corresponding financing liability for landlord-paid construction costs (i.e., “build-to-suit” accounting). Once construction was complete, the Company considered the requirements for sale-leaseback accounting treatment, including evaluating whether all risks of ownership have been transferred back to the landlord, as evidenced by a lack of continuing involvement in the leased property. Since the arrangement did not qualify for sale-leaseback accounting treatment, the building asset remained on the Company’s consolidated balance sheets at its historical cost, and such asset was depreciated over its estimated useful life. The Company bifurcated its lease payments into a portion allocated to the building and a portion allocated to the parcel of land on which the building has been built. The portion of the lease payments allocated to the land was treated for accounting purposes as operating lease payments, and therefore was recorded as rent expense in the consolidated statements of operations and comprehensive loss. The portion of the lease payments allocated to the building was further bifurcated into a portion allocated to interest expense and a portion allocated to reduce the build-to-suit lease obligation. The initial recording of these assets and liabilities were classified as non-cash investing and financing items, respectively, for purposes of the consolidated statements of cash flows. The build-to-suit asset and corresponding lease obligation was derecognized upon adoption of the new lease standard as we did not control the building during the construction period. See Note 8 for further information. |
Asset Retirement Obligations ("ARO") | Asset Retirement Obligations (“ARO”) ARO are legal obligations associated with the retirement of long-lived assets pertaining to leasehold improvements. These liabilities are initially recorded at fair value and the related asset retirement costs are capitalized by increasing the carrying amount of the related assets by the same amount as the liability. Asset retirement costs are subsequently depreciated over the useful lives of the related assets. Subsequent to initial recognition, the Company records period-to-period changes in the ARO liability resulting from the passage of time and revisions to either the timing or the amount of the original estimate of undiscounted cash flows. The Company derecognizes ARO liabilities when the related obligations are settled. |
Foreign Currency | Foreign Currency Transactions and monetary assets and liabilities that are denominated in a foreign currency are translated into U.S. dollars at the current exchange rate on the transaction date and as of each balance sheet date, respectively, with gains or losses on foreign exchange changes recognized in interest and other income (expense), net in the consolidated statements of operations and comprehensive loss. Foreign currency-denominated monetary assets and liabilities as of December 31, 2020 were not material. |
Cash Equivalents and Short-Term Investments | Cash Equivalents and Short-Term Investments Cash equivalents are defined as short-term, highly liquid investments with original maturities of 90 days or less at the date of purchase, and generally consist of money market funds, U.S. Treasury, government agency and corporate debt obligations, and commercial paper. Investments with original maturities of greater than 90 days are classified as short-term investments on the balance sheet, and consist primarily of U.S. Treasury, government agency and corporate debt obligations, commercial paper and asset-backed securities. As our entire investment portfolio is considered available for use in current operations, we classify all investments as available-for-sale and as current assets, even though the stated maturity may be more than one year from the current balance sheet date. Available-for-sale securities are carried at fair value, with unrealized gains and losses reported in accumulated other comprehensive loss, which is a separate component of stockholders’ equity in the consolidated balance sheet. The amortized cost of securities is adjusted for amortization of premiums and accretion of discounts to maturity, which are both recorded to interest and other income (expense), net in the consolidated statements of operations and comprehensive loss. Changes in the fair value of available-for-sale securities impact the consolidated statements of operations and comprehensive loss only when such securities are sold, if an allowance for credit losses is recognized or if an impairment is recognized. Realized gains and losses on the sale of securities are determined by specific identification of each security’s cost basis. We regularly review our investment portfolio to determine if any security is impaired, which would require us to record an allowance for credit losses or impairment charge in the period any such determination is made. In making this judgment, we evaluate, among other things, the duration and extent to which the fair value of a security is less than its cost, our intent to sell or whether it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis, the financial condition of the issuer and any changes thereto, and, as necessary, the portion of a decline in fair value that is credit-related. This assessment could change in the future due to new developments or changes in assumptions related to any particular security. Realized gains and losses, allowances for credit losses and impairments on available-for-sale securities, if any, are recorded to interest and other income, net in the statements of operations and comprehensive loss. |
Fair Value Measurement | Fair Value Measurement The carrying amounts of certain of our financial instruments including cash equivalents, accounts receivable, prepaid expenses and other current assets, accounts payable and accrued liabilities approximate fair value due to their short maturities. Short-term investments are comprised of available-for-sale securities, which are carried at fair value. |
Fair Value of Financial Instruments | Fair Value of Financial Instruments Our financial assets are measured at fair value on a recurring basis using the following hierarchy to prioritize valuation inputs, Level 1: Quoted prices in active markets for identical assets or liabilities that we have the ability to access Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data such as quoted prices, interest rates and yield curves Level 3: Inputs that are unobservable data points that are not corroborated by market data We review the fair value hierarchy classification on a quarterly basis. Changes in the ability to observe valuation inputs may result in a reclassification of levels of certain securities within the fair value hierarchy. We recognize transfers into and out of levels within the fair value hierarchy in the period in which the actual event or change in circumstances that caused the transfer occurs. There have been no transfers between Level 1, Level 2, and Level 3 in any periods presented. Financial assets and liabilities are considered Level 2 when their fair values are determined using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing for similar securities, recently executed transactions, cash flow models with yield curves, and benchmark securities. In addition, Level 2 financial instruments are valued using comparisons to like-kind financial instruments and models that use readily observable market data as their basis. U.S. Treasury, government agency and corporate debt obligations, commercial paper and asset-backed securities are valued primarily using market prices of comparable securities, bid/ask quotes, interest rate yields and prepayment spreads and are included in Level 2. Financial assets and liabilities are considered Level 3 when their fair values are determined using pricing models, discounted cash flow methodologies, or similar techniques, and at least one significant model assumption or input is unobservable. We have no Level 3 financial assets or liabilities. |
Property and Equipment, Net | Property and Equipment, net Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the assets, ranging from three to five years. Costs incurred to acquire, construct or install property and equipment during the construction stage of a capital project or costs incurred to purchase and develop internal use software during the application development stage are recorded as construction in progress. Leasehold improvements are amortized over the lesser of the life of the leasehold improvements or the lease term. Maintenance and repairs are charged to operations as incurred. |
Long-lived Assets | Long-lived Assets We evaluate the carrying amount of our long-lived assets whenever events or changes in circumstances indicate that the assets may not be recoverable. An impairment loss would be recognized when estimated future cash flows expected to result from the use of the asset and its eventual disposition are less than the carrying amount of the asset. To date, there have been no such impairment losses. |
Stock-Based Compensation Expense | Stock-Based Compensation Expense We account for stock-based compensation expense, including the expense of restricted common stock awards (“RSAs”), grants of restricted stock units (“RSUs”), and stock options that may be settled in shares of our common stock, based on the fair values of the equity instruments issued. The fair value is determined on the measurement date, which is generally the date of grant. The fair value for our RSAs is their intrinsic value, which is the difference between the fair value of the underlying stock at the measurement date and the purchase price. The fair value of our RSUs is the fair value of the underlying stock at the measurement date. The fair value for our stock option awards is determined at the grant date using the Black-Scholes valuation model. For awards with performance-based vesting criteria, we assess the probability of the achievement of the performance conditions at the end of each reporting period and begin to recognize the share-based compensation costs when it becomes probable that the performance conditions will be met. For awards that are subject to both service and performance conditions, no expense is recognized until it is probable that performance conditions will be met. Stock-based compensation expense for awards with time-based vesting criteria is recognized as expense on a straight-line basis over the requisite service period. Stock-based compensation expense for awards with performance and other vesting criteria is recognized as expense under an accelerated graded vesting model. Key assumptions used in the Black-Scholes valuation model used for employee stock awards include: Expected term – We derived the expected term using the “simplified” method (the expected term is determined as the average of the time-to-vesting and the contractual life of the options), as we have limited historical information to develop expectations about future exercise patterns and post vesting employment termination behavior. Expected volatility – Expected volatility is estimated using comparable public companies’ volatility for similar terms. Expected dividend – We have not historically declared or paid dividends to our stockholders and have no plans to pay dividends; therefore, we assumed an expected dividend yield of 0%. Risk-free interest rate – The risk-free interest rate is based on the yield on U.S. Treasury securities with the expected term of the associated award. The fair value of our common stock is based on observable market prices. We account for forfeitures of stock-based awards as they occur. |
Revenue Recognition | Revenue Recognition At inception, we determine whether contracts are within the scope of Accounting Standards Codification Topic 606 (ASU No. 2014-09), Revenue from Contracts with Customers Performance obligations promised in a contract are identified based on the goods and services that will be transferred to the customer that are both capable of being distinct and are distinct in the context of the contract. To the extent a contract includes multiple promised goods and services, we apply judgment to determine whether promised goods and services are both capable of being distinct and distinct in the context of the contract. If these criteria are not met, the promised goods and services are accounted for as a combined performance obligation. The transaction price is determined based on the consideration to which we will be entitled in exchange for transferring goods and services to the customer. To the extent the transaction price includes variable consideration, we estimate the amount of variable consideration that should be included in the transaction price utilizing either the expected value method or the most likely amount method, depending on the nature of the variable consideration. Variable consideration is included in the transaction price if, in our judgment, it is probable that a significant future reversal of cumulative revenue under the contract will not occur. Any estimates, including the effect of the constraint on variable consideration, are evaluated at each reporting period for any changes. Determining the transaction price requires significant judgment, which is discussed in further detail for our research and license agreement in Note 7. Our research and license agreement did not contain a significant financing component. If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation on a relative standalone selling price basis unless the transaction price is variable and meets the criteria to be allocated entirely to a performance obligation or to a distinct service that forms part of a single performance obligation. The consideration to be received is allocated among the separate performance obligations based on relative standalone selling prices. We typically determine standalone selling prices using an adjusted market assessment approach model. We satisfy performance obligations either over time or at a point in time. Revenue is recognized over time if either (i) the customer simultaneously receives and consumes the benefits provided by our performance, (ii) our performance creates or enhances an asset that the customer controls as the asset is created or enhanced or (iii) our performance does not create an asset with an alternative use to the entity and we have an enforceable right to payment for performance completed to date. If we do not satisfy a performance obligation over time, the related performance obligation is satisfied at a point in time by transferring control of a promised good or service to a customer. We evaluate the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition. As of December 31, 2020 , our deferred revenue is related to the Bayer License Agreement, which is within the scope of ASC 606. A s discussed in further detail in Note 7 , the terms of this arrangement include potential payments to us for the following: nonrefundable, upfront fees; development, regulatory, and commercial milestone payments; research and development funding payments; and royalties on the net sales of licensed products. T hese payments relate to promised goods or services for which revenue will be recognized upon our satisfaction of the underlying performance obligations . Licenses of intellectual property Milestone payments Royalties We receive payments from our customer based on billing schedules established in each contract. Our contract liabilities consist of deferred revenue. Upfront payments and fees are recorded as deferred revenue upon receipt or when due and may require deferral of revenue recognition to a future period until the we have satisfied our obligations under these arrangements. Certain judgments affect the application of our revenue recognition policy. For example, we record short-term and long-term deferred revenue based on our best estimate of when such revenue will be recognized. Short-term deferred revenue consists of amounts that are expected to be recognized as revenue in the next 12 months, and long-term deferred revenue consists of amounts that we do not expect will be recognized in the next 12 months. This estimate is based on our current operating plan and, if our operating plan should change in the future, we may recognize a different amount of deferred revenue over the next 12-month period. |
Contract Balances | Contract Balances Customer payments are recorded as deferred revenue upon receipt or when invoiced and may require deferral of revenue recognition to a future period until we satisfy its performance obligations under these arrangements. Amounts payable to us are recorded as accounts receivable when our right to consideration is unconditional. |
Research and Development Expense | Research and Development Expense Research and development expense consists of costs incurred in performing research and development activities, including compensation and benefits for research and development employees, including stock-based compensation; expenses incurred under agreements with contract research organizations and investigative sites that conduct clinical and preclinical studies; the costs of acquiring and manufacturing clinical study materials and other supplies; payments under licensing and research and development agreements; other outside services and consulting costs, and facilities, information technology and overhead expenses. Research and development costs are expensed as incurred. |
Clinical Study Accruals | Clinical Study Accruals Costs for preclinical studies, clinical studies and manufacturing activities are recognized based on an evaluation of our vendors’ progress towards completion of specific tasks, using data such as patient enrollment, clinical site activations or information provided to us by our vendors regarding their actual costs incurred. Payments for these activities are based on the terms of individual contracts and payment timing may differ significantly from the period in which the services are performed. We determine accrual estimates through reports from and discussions with applicable personnel and outside service providers as to the progress or state of completion of studies, or the services completed. Our estimates of accrued expenses as of each balance sheet date are based on the facts and circumstances known at the time. Costs that are paid in advance of performance are deferred as a prepaid expense and amortized over the service period as the services are provided. |
Defined Contribution Plan | Defined Contribution Plan We have one qualified 401(k) plan covering all eligible employees. Under the plan, employees may contribute up to the statutory allowable amount for any calendar year. Beginning in 2019, we make matching contributions, equal to 50% of each dollar contributed up to the first 6% of an individual’s eligible earnings, up to the annual IRS maximum. For the years ended December 31, 2020 and 2019, we recorded matching contributions of approximately $2.1 million and $1.6 million, respectively. |
Other Current Liabilities | Other Current Liabilities Other current liabilities consisted of the following as of each period end: December 31, December 31, 2020 2019 (in thousands) Accrued operating expenses $ 3,016 $ 3,900 Current portion of operating lease liabilities 1,730 1,312 Current portion of finance lease liabilities 255 269 Other accrued liabilities 1,056 252 Total other current liabilities $ 6,057 $ 5,733 |
Income Taxes | Income Taxes We use the asset and liability method to account for income taxes. We record deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the tax basis of assets and liabilities using enacted tax rates expected to be in effect when the differences are expected to reverse. Valuation allowances are provided when necessary to reduce net deferred tax assets to the amount that is more likely than not to be realized. Based on the available evidence, we are unable, at this time, to support the determination that it is more likely than not that our deferred tax assets will be utilized in the future. Accordingly, we recorded a full valuation allowance as of December 31, 2020 and 2019. We intend to maintain valuation allowances until sufficient evidence exists to support their reversal. Tax benefits related to uncertain tax positions are recognized when it is more likely than not that a tax position will be sustained during an audit. Interest and penalties related to unrecognized tax benefits are included within the provision for income tax. |
Comprehensive Income (Loss) | Comprehensive Income (Loss) Comprehensive income (loss) is defined as a change in equity of a business enterprise during a period resulting from transactions from non-owner sources. Our other comprehensive income (loss) is comprised solely of unrealized gains (losses) on available-for-sale securities and is presented net of taxes. We have not recorded any reclassifications from other comprehensive income (loss) to net loss during any period presented. |
Recent Accounting Pronouncements | Recent Accounting Pronouncements The Company considers the applicability and impact of any ASUs issued by the Financial Accounting Standards Board (“FASB”). Other than the ASUs we adopted effective January 1, 2020 and listed below, all other ASUs were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial statements. Adoption of New Accounting Pronouncements We adopted ASU No. 2016-13 (as amended by ASUs 2018-19, 2019-04, 2019-05 and 2019-11), Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments We adopted ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract We adopted ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes |
Summary of Significant Accoun_3
Summary of Significant Accounting Policies (Tables) | 12 Months Ended |
Dec. 31, 2020 | |
Accounting Policies [Abstract] | |
Summary of Other Current Liabilities | Other current liabilities consisted of the following as of each period end: December 31, December 31, 2020 2019 (in thousands) Accrued operating expenses $ 3,016 $ 3,900 Current portion of operating lease liabilities 1,730 1,312 Current portion of finance lease liabilities 255 269 Other accrued liabilities 1,056 252 Total other current liabilities $ 6,057 $ 5,733 |
Net Loss per Common Share (Tabl
Net Loss per Common Share (Tables) | 12 Months Ended |
Dec. 31, 2020 | |
Earnings Per Share [Abstract] | |
Antidilutive Securities Excluded From Computation of Diluted Net Loss per Common Share | The following table represents the potential common shares issuable pursuant to outstanding securities as of the related period end dates that were excluded from the computation of diluted net loss per common share, as their inclusion would have an antidilutive effect: As of December 31, 2020 2019 2018 Unvested RSUs 2,868,407 1,910,764 1,405,460 Vested and unvested options 7,832,386 6,934,262 6,276,999 ESPP share purchase rights 26,349 20,438 7,974 Total 10,727,142 8,865,464 7,690,433 |
Financial Instruments (Tables)
Financial Instruments (Tables) | 12 Months Ended |
Dec. 31, 2020 | |
Financial Instruments Disclosure [Abstract] | |
Summary of Estimated Fair Value and Related Valuation Input Hierarchy of Available-for-Sale Securities | The following tables summarize the estimated fair value and related valuation input hierarchy of our available-for-sale securities as of each period end: Total Total Total Total Amortized Unrealized Unrealized Estimated As of December 31, 2020: Input Level Cost Gain Loss Fair Value (in thousands) Money market funds Level 1 $ 168,343 $ — $ — $ 168,343 U.S. Treasury obligations Level 2 230,239 113 (6 ) 230,346 Government agency obligations Level 2 22,537 22 (3 ) 22,556 Corporate debt obligations Level 2 50,080 166 (1 ) 50,245 Commercial paper Level 2 17,990 — — 17,990 Asset-backed securities Level 2 9,860 10 (5 ) 9,865 Total available-for-sale securities 499,049 311 (15 ) 499,345 Less: amounts classified as cash equivalents (199,090 ) — — (199,090 ) Amounts classified as short-term investments $ 299,959 $ 311 $ (15 ) $ 300,255 Total Total Total Total Amortized Unrealized Unrealized Estimated As of December 31, 2019: Input Level Cost Gain Loss Fair Value (in thousands) Money market funds Level 1 $ 63,554 $ — $ — $ 63,554 U.S. Treasury obligations Level 2 52,805 46 (1 ) 52,850 Government agency obligations Level 2 6,151 1 (1 ) 6,151 Corporate debt obligations Level 2 100,512 180 (10 ) 100,682 Commercial paper Level 2 26,290 — — 26,290 Asset-backed securities Level 2 7,266 6 — 7,272 Certificate of deposit Level 2 500 — — 500 Total available-for-sale securities 257,078 233 (12 ) 257,299 Less: amounts classified as cash equivalents (72,507 ) — — (72,507 ) Amounts classified as short-term investments $ 184,571 $ 233 $ (12 ) $ 184,792 |
Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity | The amortized cost and fair value of our available-for-sale securities by contractual maturity were as follows: As of December 31, 2020 As of December 31, 2019 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value (in thousands) (in thousands) Maturing within one year $ 434,828 $ 435,023 $ 214,085 $ 214,199 Maturing in one to five years 64,221 64,322 42,993 43,100 Total available-for-sale securities $ 499,049 $ 499,345 $ 257,078 $ 257,299 |
Reconciliation of Cash, Cash Equivalents and Restricted Cash | The following table provides a reconciliation of cash, cash equivalents and restricted cash within the consolidated balance sheets that sum to the total of the same such amounts in the consolidated statement of cash flows: December 31, December 31, 2020 2019 (in thousands) Cash and cash equivalents $ 200,404 $ 74,317 Restricted cash - short-term 194 194 Restricted cash - long-term 1,200 1,200 Total cash, cash equivalents and restricted cash $ 201,798 $ 75,711 |
Property and Equipment (Tables)
Property and Equipment (Tables) | 12 Months Ended |
Dec. 31, 2020 | |
Property Plant And Equipment [Abstract] | |
Schedule of Property and Equipment | Property and equipment consisted of the following as of each period end: December 31, December 31, 2020 2019 (in thousands) Leasehold improvements $ 50,132 $ 49,028 Lab equipment 8,033 6,815 Machinery and equipment 5,023 3,832 Computer equipment and software 4,060 3,299 Furniture and fixtures 2,066 1,764 Construction in progress 879 1,116 Property and equipment, gross 70,193 65,854 Less: accumulated depreciation and amortization (19,676 ) (11,678 ) Property and equipment, net $ 50,517 $ 54,176 |
Leases (Tables)
Leases (Tables) | 12 Months Ended |
Dec. 31, 2020 | |
Leases [Abstract] | |
Schedule of Maturities of Lease Liabilities Under Operating and Finance Leases | The maturities of lease liabilities under our operating and finance leases as of December 31, 2020 were as follows: Operating Leases Finance Leases Years Ending December 31, (in thousands) 2021 $ 3,177 $ 282 2022 2,835 130 2023 2,696 29 2024 2,593 — 2025 2,587 — Thereafter 9,300 — Total lease payments $ 23,188 $ 441 Less: amount representing interest (8,417 ) (37 ) Present value of lease liabilities $ 14,771 $ 404 Balance as of December 31, 2020 Other current liabilities $ 1,730 $ 255 Operating lease liabilities - long-term 13,041 — Other long-term liabilities — 149 Total $ 14,771 $ 404 |
Components of Lease Cost | The components of lease cost were as follows: Year Ended Year Ended December 31, 2020 December 31, 2019 (in thousands) Operating lease cost: Operating lease cost $ 3,020 $ 2,578 Short-term lease cost 987 770 Total operating lease cost $ 4,007 $ 3,348 Finance lease cost: Amortization expense $ 389 $ 324 Interest on lease liabilities 60 56 Total finance lease cost $ 449 $ 380 |
Summary of Other Information Related to Leases | Other information related to leases was as follows: Year Ended Year Ended December 31, 2020 December 31, 2019 (in thousands, except lease term and discount rate) Supplemental Cash Flows Information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 2,878 $ 2,346 Operating cash flows for finance leases 62 50 Financing cash flows for finance leases 389 486 Operating lease assets obtained in exchange for lease obligations: $ — $ 838 Finance lease assets obtained in exchange for lease obligations: 281 323 Non-cash increase to operating lease assets due to remeasurement of lease liabilities: 639 — Weighted Average Remaining Lease Term Operating leases 9.4 years 10.3 years Finance leases 1.7 years 2.5 years Weighted Average Discount Rate Operating leases 10.3 % 10.4 % Finance leases 9.7 % 10.0 % |
Summary of Activity for ARO Liabilities | The following table presents the activity for our ARO liabilities: ARO Liability (In thousands) Balance as of December 31, 2019 $ 788 Accretion expense 78 Balance as of December 31, 2020 $ 866 |
Stockholders' Equity (Tables)
Stockholders' Equity (Tables) | 12 Months Ended |
Dec. 31, 2020 | |
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |
Summary of RSU Activity | The following is a summary of RSU activity under our 2014 EIP and Inducement Plan: RSUs Shares Weighted Average Grant Date Fair Value Balance as of December 31, 2019 1,910,764 $ 26.93 Granted 3,973,991 $ 12.19 Forfeited (836,190 ) $ 18.39 Vested (1,218,945 ) $ 19.34 Balance as of December 31, 2020 3,829,620 $ 15.91 |
Summary of Stock Option Activity | The following is a summary of stock option activity under our 2014 EIP and Inducement Plan. The table below also includes the activity relating to options for 275,000 shares of our common stock which were issued in 2017 outside of these plans: Shares Weighted Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Balance as of December 31, 2019 6,934,262 $ 28.25 5.9 $ 4,103 Granted 2,641,125 12.01 Exercised (268,938 ) 14.75 Forfeited or expired (1,454,563 ) 30.17 Balance as of December 31, 2020 7,851,886 $ 22.89 6.4 $ 26,834 Vested and expected to vest as of December 31, 2020 7,851,886 $ 22.89 6.4 $ 26,834 Exercisable as of December 31, 2020 3,747,718 $ 26.74 4.5 $ 6,214 |
Summary of Options Estimated with Weighted Average | The fair value of each option issued was estimated at the date of grant using the Black-Scholes valuation model. The following table summarizes the weighted-average assumptions used as inputs to the Black-Scholes model and resulting weighted-average grant date fair values of stock options granted during the periods indicated: Year ended December 31, 2020 2019 2018 Assumptions: Expected term (years) 6.0 5.9 4.6 Expected volatility 76.8 % 76.1 % 73.5 % Risk-free interest rate 0.8 % 2.1 % 2.7 % Expected dividend yield 0.0 % 0.0 % 0.0 % Fair Value: Weighted-average estimated grant date fair value per share $ 7.96 $ 18.06 $ 22.96 Options granted 2,641,125 2,535,425 2,998,650 Total estimated grant date fair value $ 21,023,000 $ 45,790,000 $ 68,849,000 |
Schedule of Common Stock Reserved for Future Issuance Under Equity Incentive Plans | The following shares of common stock were reserved for future issuance under our equity incentive plans as of December 31, 2020 Total Shares Reserved 2014 Equity Incentive Plan 13,545,106 2018 Inducement Plan 2,634,836 2014 Employee Stock Purchase Plan 950,803 Total reserved shares of common stock 17,130,745 |
Schedule of Stock-based Compensation Related to Stock Awards | Total stock-based compensation expense related to all stock awards was as follows: Year Ended December 31, 2020 2019 2018 (in thousands) Research and development $ 31,527 $ 26,773 $ 16,211 General and administrative 19,824 24,923 17,606 Total stock-based compensation expense $ 51,351 $ 51,696 $ 33,817 |
Income Taxes (Tables)
Income Taxes (Tables) | 12 Months Ended |
Dec. 31, 2020 | |
Income Tax Disclosure [Abstract] | |
Losses Before Provision for Income Taxes | Losses before provision for income taxes were as follows in each period presented: Year Ended December 31, 2020 2019 2018 (in thousands) United States $ (306,758 ) $ (291,049 ) $ (230,765 ) Foreign 153 85 22 Total loss before provision for income taxes $ (306,605 ) $ (290,964 ) $ (230,743 ) |
Components of Provision for (Benefit from) Income Taxes | The components of provision for (benefit from) income taxes were as follows in each period presented: Year Ended December 31, 2020 2019 2018 (in thousands) Current provision for (benefit from) income taxes: Federal $ — $ — $ (31 ) State 2 — (15 ) Foreign 13 12 2 Total current provision for (benefit from) income taxes $ 15 $ 12 $ (44 ) |
Reconciliation of Statutory Tax Rates to Effective Tax Rates | A reconciliation of statutory tax rates to effective tax rates were as follows in each of the periods presented: Year Ended December 31, 2020 2019 2018 Federal income taxes at statutory rate 21.0 % 21.0 % 21.0 % Impact of stock compensation (2.4 %) 0.1 % — Non-deductible executive compensation (0.1 %) (0.7 %) (0.7 %) Capitalized research — — 7.8 % Other 0.3 % (0.2 %) (0.6 %) Change in valuation allowance (18.8 %) (20.2 %) (27.5 %) Effective tax rate 0.0 % 0.0 % 0.0 % |
Components of Deferred Tax Assets and Liabilities | Significant components of our deferred tax assets and liabilities were as follows for each of the dates presented: As of December 31, 2020 2019 (in thousands) Deferred tax assets: Net operating losses $ 237,010 $ 162,436 Stock-based compensation 20,672 17,573 Capitalized expenses 12,590 14,129 License fees 8,159 6,870 Operating lease liabilities 4,251 4,325 Legal fees 2,136 1,683 Tax credits 1,580 — Other 5,360 3,329 Total deferred tax assets 291,758 210,345 Valuation allowance (287,349 ) (205,249 ) Total deferred tax assets 4,409 5,096 Deferred tax liabilities: Operating lease assets (3,541 ) (3,921 ) Other (868 ) (1,175 ) Total deferred tax liabilities (4,409 ) (5,096 ) Net deferred tax assets (liabilities) $ — $ — |
Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits | The changes in the balance of gross unrecognized tax benefits, which excludes interest and penalties, for the years ended December 31, 2018, 2019 and 2020 are as follows: (In thousands) Balance as of January 1, 2018 $ 30,051 Gross increases for tax positions related to current year 12,927 Gross increases for tax positions related to prior year 704 Gross decreases for tax positions related to prior year (2,608 ) Balance as of December 31, 2018 41,074 Gross increases for tax positions related to current year 22,800 Gross increases for tax positions related to prior year 22,126 Gross decreases for tax positions related to prior year — Balance as of December 31, 2019 86,000 Gross increases for tax positions related to current year 24,648 Gross increases for tax positions related to prior year — Gross decreases for tax positions related to prior year (47 ) Balance as of December 31, 2020 $ 110,601 |
Description of Business (Detail
Description of Business (Detail) | 12 Months Ended |
Dec. 31, 2020 | |
Description Of Business [Abstract] | |
Entity incorporation state | DE |
Entity incorporation date | Aug. 1, 2012 |
Summary of Significant Accoun_4
Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended | |||
Dec. 31, 2020USD ($)Segment | Dec. 31, 2019USD ($) | Dec. 31, 2018 | Jan. 01, 2019USD ($) | |
Significant Accounting Policies [Line Items] | ||||
Number of reportable segments | Segment | 1 | |||
Number of operating segments | Segment | 1 | |||
Operating lease assets | $ 12,303,000 | $ 14,007,000 | $ 14,300,000 | |
Operating lease liabilities | 14,771,000 | $ 15,300,000 | ||
Lease obligation | $ 10,300,000 | |||
Cash and cash equivalents maturity period | 90 days | |||
Investment maturity period | 90 days | |||
Impairment of long-lived assets | $ 0 | |||
Expected dividend yield | 0.00% | 0.00% | 0.00% | |
Defined contribution plan, plan name | 401(k) | |||
Defined contribution plan, matching contribution percentage | 50.00% | |||
Defined contribution plan, maximum percentage of an individual's eligible earnings | 6.00% | |||
Defined contribution plan contributions by employer | $ 2,100,000 | $ 1,600,000 | ||
Minimum | ||||
Significant Accounting Policies [Line Items] | ||||
Property, plant and equipment, useful life | 3 years | |||
Maximum | ||||
Significant Accounting Policies [Line Items] | ||||
Property, plant and equipment, useful life | 5 years | |||
ASU 2016-02 | ||||
Significant Accounting Policies [Line Items] | ||||
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true | |||
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 1, 2019 | |||
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true | |||
ASU 2016-13 | ||||
Significant Accounting Policies [Line Items] | ||||
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true | |||
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 1, 2020 | |||
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true | |||
ASU 2018-15 | ||||
Significant Accounting Policies [Line Items] | ||||
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true | |||
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 1, 2020 | |||
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true | |||
ASU 2019-12 | ||||
Significant Accounting Policies [Line Items] | ||||
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 1, 2020 | |||
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true | |||
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] | true |
Summary of Significant Accoun_5
Summary of Significant Accounting Policies - Summary of Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 |
Accounting Policies [Abstract] | ||
Accrued operating expenses | $ 3,016 | $ 3,900 |
Current portion of operating lease liabilities | 1,730 | 1,312 |
Current portion of finance lease liabilities | 255 | 269 |
Other accrued liabilities | 1,056 | 252 |
Total other current liabilities | $ 6,057 | $ 5,733 |
Net Loss per Common Share - Ant
Net Loss per Common Share - Antidilutive Securities Excluded From Computation of Diluted Net Loss per Common Share (Detail) - shares | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |||
Antidilutive securities excluded from computation of earnings per share | 10,727,142 | 8,865,464 | 7,690,433 |
Unvested RSUs | |||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |||
Antidilutive securities excluded from computation of earnings per share | 2,868,407 | 1,910,764 | 1,405,460 |
Vested and Unvested Options | |||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |||
Antidilutive securities excluded from computation of earnings per share | 7,832,386 | 6,934,262 | 6,276,999 |
ESPP Share Purchase Rights | |||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |||
Antidilutive securities excluded from computation of earnings per share | 26,349 | 20,438 | 7,974 |
Financial Instruments - Summary
Financial Instruments - Summary of Estimated Fair Value and Related Valuation Input Hierarchy of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 |
Schedule of Available-for-sale Securities [Line Items] | ||
Total Fair Value | $ 499,345 | $ 257,299 |
Fair Value, Measurements, Recurring | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 499,049 | 257,078 |
Total Unrealized Gain | 311 | 233 |
Total Unrealized Loss | (15) | (12) |
Total Fair Value | 499,345 | 257,299 |
Fair Value, Measurements, Recurring | Money Market Funds | Level 1 | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 168,343 | 63,554 |
Total Unrealized Gain | 0 | 0 |
Total Unrealized Loss | 0 | 0 |
Total Fair Value | 168,343 | 63,554 |
Fair Value, Measurements, Recurring | U.S. Treasury Obligations | Level 2 | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 230,239 | 52,805 |
Total Unrealized Gain | 113 | 46 |
Total Unrealized Loss | (6) | (1) |
Total Fair Value | 230,346 | 52,850 |
Fair Value, Measurements, Recurring | Government Agency Obligations | Level 2 | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 22,537 | 6,151 |
Total Unrealized Gain | 22 | 1 |
Total Unrealized Loss | (3) | (1) |
Total Fair Value | 22,556 | 6,151 |
Fair Value, Measurements, Recurring | Corporate Debt Obligations | Level 2 | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 50,080 | 100,512 |
Total Unrealized Gain | 166 | 180 |
Total Unrealized Loss | (1) | (10) |
Total Fair Value | 50,245 | 100,682 |
Fair Value, Measurements, Recurring | Commercial Paper | Level 2 | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 17,990 | 26,290 |
Total Unrealized Gain | 0 | 0 |
Total Unrealized Loss | 0 | 0 |
Total Fair Value | 17,990 | 26,290 |
Fair Value, Measurements, Recurring | Asset-Backed Securities | Level 2 | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 9,860 | 7,266 |
Total Unrealized Gain | 10 | 6 |
Total Unrealized Loss | (5) | 0 |
Total Fair Value | 9,865 | 7,272 |
Fair Value, Measurements, Recurring | Certificate of Deposit | Level 2 | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 500 | |
Total Unrealized Gain | 0 | |
Total Unrealized Loss | 0 | |
Total Fair Value | 500 | |
Fair Value, Measurements, Recurring | Amounts Classified As Cash Equivalents | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 199,090 | 72,507 |
Total Unrealized Gain | 0 | 0 |
Total Unrealized Loss | 0 | 0 |
Total Fair Value | 199,090 | 72,507 |
Fair Value, Measurements, Recurring | Amounts Classified As Short-Term Investments | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Total Amortized Cost | 299,959 | 184,571 |
Total Unrealized Gain | 311 | 233 |
Total Unrealized Loss | (15) | (12) |
Total Fair Value | $ 300,255 | $ 184,792 |
Financial Instruments - Amortiz
Financial Instruments - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 |
Amortized cost | ||
Maturing within one year, Amortized cost | $ 434,828 | $ 214,085 |
Maturing in one to five years, Amortized cost | 64,221 | 42,993 |
Total available-for-sale securities, Amortized cost | 499,049 | 257,078 |
Estimated Fair value | ||
Maturing within one year, Estimated fair value | 435,023 | 214,199 |
Maturing in one to five years, Estimated fair value | 64,322 | 43,100 |
Total available-for-sale securities, Estimated fair value | $ 499,345 | $ 257,299 |
Financial Instruments - Additio
Financial Instruments - Additional Information (Detail) - USD ($) | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Financial Instruments Disclosure [Abstract] | |||
Accrued interest receivable | $ 700,000 | $ 900,000 | |
Write off, of accrued interest receivable | 0 | 0 | $ 0 |
Restricted Cash | $ 1,400,000 | $ 1,400,000 |
Financial Instruments - Reconci
Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 |
Financial Instruments Disclosure [Abstract] | ||||
Cash and cash equivalents | $ 200,404 | $ 74,317 | ||
Restricted cash - short-term | 194 | 194 | ||
Restricted cash - long-term | 1,200 | 1,200 | ||
Total cash, cash equivalents and restricted cash | $ 201,798 | $ 75,711 | $ 62,092 | $ 80,617 |
Property and Equipment - Schedu
Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 |
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | $ 70,193 | $ 65,854 |
Less: accumulated depreciation and amortization | (19,676) | (11,678) |
Property and equipment, net | 50,517 | 54,176 |
Leasehold Improvements | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 50,132 | 49,028 |
Lab Equipment | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 8,033 | 6,815 |
Machinery and Equipment | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 5,023 | 3,832 |
Computer Equipment and Software | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 4,060 | 3,299 |
Furniture and Fixtures | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 2,066 | 1,764 |
Construction in Progress | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | $ 879 | $ 1,116 |
Property and Equipment - Additi
Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Property Plant And Equipment Net By Type [Abstract] | |||
Depreciation and amortization expense | $ 8,332 | $ 7,070 | $ 3,732 |
License, Collaboration and Ma_2
License, Collaboration and Manufacturing Agreements - Additional Information (Detail) - USD ($) | 3 Months Ended | ||
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | |
License, Collaboration and Manufacturing Agreements [Line Items] | |||
Contractual obligations due to Bayer, MSK and QIMR | $ 0 | $ 0 | |
MSK Agreements | |||
License, Collaboration and Manufacturing Agreements [Line Items] | |||
Potential milestone payments payable | $ 33,000,000 | ||
Payments for research and development | $ 12,500,000 |
Research, Development and Lic_2
Research, Development and License Agreement - Additional Information (Detail) - Bayer License Agreement | 1 Months Ended | 12 Months Ended |
Dec. 31, 2020USD ($) | Dec. 31, 2020USD ($) | |
License, Collaboration and Manufacturing Agreements [Line Items] | ||
Upfront cash payment received | $ 45,000,000 | |
Additional upfront reimbursement payment for research and process development | 15,000,000 | |
Additional upfront cash payment entitle to receive for translational activities, invoiced amount | $ 1,300,000 | $ 1,300,000 |
Royalty eligible to receive term after first commercial sale | 12 years | |
Determined upfront payment for license in order to evaluate transaction price | $ 45,000,000 | |
Determined research and process development activities in order to evaluate transaction price | 15,000,000 | |
Determined additional specified translational activities in order to evaluate transaction price | 5,000,000 | |
Revenue | 0 | |
Deferred revenue | 61,300,000 | 61,300,000 |
Development or sales-based milestone payments received | 0 | |
Current Liabilities | ||
License, Collaboration and Manufacturing Agreements [Line Items] | ||
Deferred revenue | 33,500,000 | 33,500,000 |
Long-Term Liabilities | ||
License, Collaboration and Manufacturing Agreements [Line Items] | ||
Deferred revenue | 27,800,000 | 27,800,000 |
Maximum | ||
License, Collaboration and Manufacturing Agreements [Line Items] | ||
Additional upfront cash payment entitle to receive for translational activities | 5,000,000 | 5,000,000 |
Aggregate milestone payments entitle to receive upon achieving certain development, regulatory and commercial milestones | $ 610,000,000 | $ 610,000,000 |
Research, Development and Lic_3
Research, Development and License Agreement - Additional Information (Detail 1) | Dec. 31, 2020 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01 | |
License, Collaboration and Manufacturing Agreements [Line Items] | |
Revenue expected to be recognized over period | 3 years |
Leases - Additional Information
Leases - Additional Information (Detail) | Feb. 15, 2018USD ($)ft² | Dec. 31, 2020USD ($) | Dec. 31, 2019USD ($) | Dec. 31, 2018USD ($) |
Lessee Lease Description [Line Items] | ||||
Rent expenses under operating leases | $ 2,200,000 | |||
Build To Suit Lease Arrangement | ||||
Lessee Lease Description [Line Items] | ||||
Ground lease expense | 400,000 | |||
ASU 2016-02 | Build To Suit Lease Arrangement | ||||
Lessee Lease Description [Line Items] | ||||
Ground lease expense | $ 0 | $ 0 | ||
Building | Build To Suit Lease Arrangement | ||||
Lessee Lease Description [Line Items] | ||||
Build-to-suit asset | 10,300,000 | |||
Capitalized interest costs during the construction period | $ 300,000 | |||
South San Francisco California | ||||
Lessee Lease Description [Line Items] | ||||
Lease expiration date | May 31, 2022 | |||
Lease option to extend additional term | 5 years | |||
South San Francisco California | Letter of Credit | ||||
Lessee Lease Description [Line Items] | ||||
Letter of credit maintained | $ 200,000 | |||
Letter of credit renewal term | 12 months | |||
Thousand Oaks California | ||||
Lessee Lease Description [Line Items] | ||||
Lease option to extend additional term | 5 years | |||
Lease agreement area of office, lab and cellular therapy manufacturing space | ft² | 90,580 | |||
Lease commencement date | Feb. 15, 2018 | |||
Lease initial term | 15 years | |||
Contractual obligations | $ 16,400,000 | |||
Lease extension term, option one | 10 years | |||
Lease extension term, option two | 9 years | |||
Thousand Oaks California | Letter of Credit | ||||
Lessee Lease Description [Line Items] | ||||
Letter of credit issued, classified as long-term restricted cash | $ 1,200,000 | |||
Thousand Oaks California | Additional Office Space | ||||
Lessee Lease Description [Line Items] | ||||
Lease expiration date | Feb. 28, 2026 | |||
Aurora Colorado | ||||
Lessee Lease Description [Line Items] | ||||
Lease expiration date | Apr. 30, 2024 |
Leases - Schedule of Maturities
Leases - Schedule of Maturities of Lease Liabilities Under Operating and Finance Leases (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 |
Leases [Abstract] | |||
Operating leases, 2021 | $ 3,177 | ||
Operating leases, 2022 | 2,835 | ||
Operating leases, 2023 | 2,696 | ||
Operating leases, 2024 | 2,593 | ||
Operating leases, 2025 | 2,587 | ||
Operating leases, Thereafter | 9,300 | ||
Operating leases, Total minimum payments | 23,188 | ||
Less: amount representing interest | (8,417) | ||
Present value of lease liabilities | 14,771 | $ 15,300 | |
Other current liabilities | $ 1,730 | $ 1,312 | |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesCurrent | ||
Operating lease liabilities - long-term | $ 13,041 | 14,136 | |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent | ||
Total | $ 14,771 | $ 15,300 | |
Finance leases, 2021 | 282 | ||
Finance leases, 2022 | 130 | ||
Finance leases, 2023 | 29 | ||
Finance leases, 2024 | 0 | ||
Finance leases, 2025 | 0 | ||
Finance leases, Thereafter | 0 | ||
Finance leases, Total minimum payments | 441 | ||
Less: amount representing interest | (37) | ||
Present value of lease liabilities | 404 | ||
Other current liabilities | $ 255 | $ 269 | |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesCurrent | ||
Other long-term liabilities | $ 149 | ||
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent | ||
Total | $ 404 |
Leases - Components of Lease Co
Leases - Components of Lease Cost (Detail) - USD ($) $ in Thousands | 12 Months Ended | |
Dec. 31, 2020 | Dec. 31, 2019 | |
Operating lease cost: | ||
Operating lease cost | $ 3,020 | $ 2,578 |
Short-term lease cost | 987 | 770 |
Total operating lease cost | 4,007 | 3,348 |
Finance lease cost: | ||
Amortization expense | 389 | 324 |
Interest on lease liabilities | 60 | 56 |
Total finance lease cost | $ 449 | $ 380 |
Leases - Summary of Other Infor
Leases - Summary of Other Information Related to Leases (Detail) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Cash paid for amounts included in the measurement of lease liabilities: | |||
Operating cash flows for operating leases | $ 2,878 | $ 2,346 | |
Operating cash flows for finance leases | 62 | 50 | |
Financing cash flows for finance leases | 389 | 486 | $ 528 |
Operating lease assets obtained in exchange for lease obligations: | 0 | 838 | |
Finance lease assets obtained in exchange for lease obligations: | 281 | 323 | |
Non-cash increase to operating lease assets due to remeasurement of lease liabilities: | $ 639 | $ 0 | |
Weighted Average Remaining Lease Term | |||
Operating leases | 9 years 4 months 24 days | 10 years 3 months 18 days | |
Finance leases | 1 year 8 months 12 days | 2 years 6 months | |
Weighted Average Discount Rate | |||
Operating leases | 10.30% | 10.40% | |
Finance leases | 9.70% | 10.00% |
Leases - Summary of Activity fo
Leases - Summary of Activity for ARO Liabilities (Detail) $ in Thousands | 12 Months Ended |
Dec. 31, 2020USD ($) | |
Leases [Abstract] | |
Balance as of December 31, 2019 | $ 788 |
Accretion expense | 78 |
Balance as of December 31, 2020 | $ 866 |
Commitments and Contingencies -
Commitments and Contingencies - Additional Information (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 |
Commitments And Contingencies Disclosure [Abstract] | ||
Accrued termination charges | $ 0 | $ 0 |
Liabilities related to indemnification agreements | $ 0 | $ 0 |
Stockholders' Equity - Addition
Stockholders' Equity - Additional Information (Detail) - USD ($) | Feb. 29, 2020 | Jan. 03, 2020 | Jul. 31, 2019 | Jul. 18, 2019 | Feb. 25, 2019 | Mar. 31, 2018 | Jan. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2020 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Authorized capital stock | 520,000,000 | |||||||||||||
Common stock, par value | $ 0.0001 | $ 0.0001 | ||||||||||||
Common stock, shares authorized | 500,000,000 | 500,000,000 | ||||||||||||
Preferred stock, par value | $ 0.0001 | |||||||||||||
Preferred stock, shares authorized | 20,000,000 | |||||||||||||
Preferred stock, shares outstanding | 0 | 0 | ||||||||||||
Stock option granted description terms | the exercise price of an option granted to a 10% shareholder cannot be less than 110% of the estimated fair value of the shares on the date of grant. Options granted generally vest over four years and expire in seven to ten years. | |||||||||||||
Ownership percent | 10.00% | |||||||||||||
Shares of common stock, reserved for issuance | 17,130,745 | |||||||||||||
Common stock, shares exercised | 268,938 | 347,716 | 1,051,180 | |||||||||||
Option intrinsic value, exercised | $ 1,000,000 | $ 3,800,000 | $ 19,200,000 | |||||||||||
Net tax benefits related to exercised options | 0 | |||||||||||||
Estimated fair value of stock option, vested | 29,400,000 | 31,600,000 | 16,200,000 | |||||||||||
Stock-based compensation expense | $ 51,351,000 | $ 51,696,000 | $ 33,817,000 | |||||||||||
Restricted Stock Units (RSUs) | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Weighted average grant date fair value per share | $ 12.19 | $ 27.04 | $ 36.83 | |||||||||||
Estimated fair value, vested in period | $ 23,600,000 | $ 13,800,000 | $ 10,800,000 | |||||||||||
Unrecognized stock-based compensation expense | $ 39,400,000 | |||||||||||||
Unrecognized stock-based compensation weighted average recognition period | 2 years 3 months 18 days | |||||||||||||
Aggregate intrinsic value | $ 75,200,000 | |||||||||||||
Restricted stock units, settled | 1,218,945 | 574,168 | ||||||||||||
RSU settlements, net of shares withheld, shares | 276,822 | 488,964 | ||||||||||||
Restricted stock units withheld for tax obligations | 106,459 | 212,879 | ||||||||||||
Restricted stock units withheld for tax obligations, value | $ 1,500,000 | $ 6,700,000 | ||||||||||||
Restricted Stock Units (RSUs) | From Date Of Grant | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Share based compensation, vesting period | 4 years | |||||||||||||
Employees And Non Employees | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Share based compensation, vesting period | 4 years | |||||||||||||
Vested and Unvested Options | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Unrecognized stock-based compensation weighted average recognition period | 2 years 7 months 6 days | |||||||||||||
Stock options, issued | 275,000 | |||||||||||||
Unrecognized stock-based compensation | $ 48,800,000 | |||||||||||||
2014 Equity Incentive Plan | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Annual increase in EIP/ESPP, subject to other limitations | 5.00% | |||||||||||||
Shares of common stock, reserved for issuance | 13,545,106 | |||||||||||||
Aggregate number of awards available for grant to be issued | 2,764,225 | |||||||||||||
Outstanding options and RSUs | 10,780,881 | |||||||||||||
Inducement Plan | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Shares of common stock, reserved for issuance | 2,634,836 | |||||||||||||
Aggregate number of awards available for grant to be issued | 1,734,211 | |||||||||||||
Outstanding options and RSUs | 900,625 | |||||||||||||
Additional shares of common stock, reserved for issuance | 1,500,000 | |||||||||||||
2014 Employee Stock Purchase Plan | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Percentage of employees purchase price of common stock | 85.00% | |||||||||||||
Shares of common stock, reserved for issuance | 950,803 | |||||||||||||
Unrecognized stock-based compensation expense | $ 600,000 | |||||||||||||
Employee stock purchase plan effective date | Oct. 15, 2014 | |||||||||||||
Employee stock purchase plan description | (i) the beginning of a 12-month offering period, or (ii) at the end of one of the two related 6-month purchase periods | |||||||||||||
Employee stock purchase plan offering commenced start date | Jun. 1, 2016 | |||||||||||||
Stock-based compensation expense | $ 1,800,000 | $ 1,300,000 | $ 1,200,000 | |||||||||||
Shares purchased | 282,514 | 139,466 | 109,193 | |||||||||||
Aggregate number of shares authorized | 1,586,742 | |||||||||||||
Minimum | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Percentage of employees purchase price of common stock | 100.00% | |||||||||||||
Minimum | 10% Shareholder | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Percentage of employees purchase price of common stock | 110.00% | |||||||||||||
Minimum | Employees And Non Employees | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Share based compensation award expiration period | 7 years | |||||||||||||
Maximum | Employees And Non Employees | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Share based compensation award expiration period | 10 years | |||||||||||||
Maximum | 2014 Employee Stock Purchase Plan | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Annual increase in EIP/ESPP, subject to other limitations | 1.00% | |||||||||||||
Stock may be issued or transferred, value | $ 25,000 | |||||||||||||
Maximum increase in number of shares available for issuance | 230,769 | |||||||||||||
Underwritten Public Offering | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Common stock, shares issued | 6,871,727 | 4,928,571 | 7,675,072 | 12,633,039 | 5,102,041 | |||||||||
Shares issued, price per share | $ 15.28 | $ 35 | $ 18.25 | $ 11.32 | $ 24.50 | |||||||||
Net proceeds from sale of common stock | $ 140,700,000 | $ 161,900,000 | $ 131,400,000 | $ 189,300,000 | $ 164,300,000 | |||||||||
Proceeds from sale of common stock, gross | $ 150,000,000 | $ 201,800,000 | $ 175,000,000 | |||||||||||
Warrants outstanding | 2,888,526 | |||||||||||||
Option price to purchase shares | $ 11.32 | |||||||||||||
Underwritten Public Offering | Maximum | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Additional shares of our common stock | 2,325,000 | |||||||||||||
Underwritten Public Offering | Warrant | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Number of warrants issued | 2,945,026 | 2,866,961 | 2,040,816 | |||||||||||
Warrant, price per share | $ 15.2799 | $ 11.3199 | $ 24.4999 | |||||||||||
Number of securities called by each warrant | 1 | |||||||||||||
Warrants, exercise price | $ 0.0001 | |||||||||||||
Warrants, term | 7 years | |||||||||||||
Maximum ownership Percentage | 9.99% | |||||||||||||
Underwritten Public Offering | Warrant | Minimum | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Prior notice period | 61 days | |||||||||||||
Underwritten Public Offering | Warrant | Maximum | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Maximum ownership Percentage | 19.99% | |||||||||||||
At The Market Offering | Cowen | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Common stock, shares issued | 4,785,514 | 3,135,347 | ||||||||||||
Net proceeds from sale of common stock | $ 1,200,000 | $ 68,000,000 | $ 48,900,000 | |||||||||||
Proceeds from sale of common stock, gross | $ 69,900,000 | $ 50,500,000 | ||||||||||||
Common stock average price | $ 14.60 | $ 16.09 | ||||||||||||
Common stock value available to be sold | $ 79,700,000 | |||||||||||||
At The Market Offering | Maximum | Cowen | ||||||||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||||||||||||
Common stock aggregate offering price | $ 100,000,000 | $ 100,000,000 | $ 75,000,000 | |||||||||||
Percentage of commission to be paid on gross sales proceeds of common stock sold | 3.00% | 3.00% | 3.00% |
Stockholders' Equity - Summary
Stockholders' Equity - Summary of RSU Activity (Detail) - Unvested RSUs - $ / shares | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
Shares, Unvested as of December 31, 2019 | 1,910,764 | ||
Shares, Granted | 3,973,991 | ||
Shares, Forfeited | (836,190) | ||
Shares, Vested | (1,218,945) | ||
Shares, Outstanding as of December 31, 2020 | 3,829,620 | 1,910,764 | |
Weighted Average Grant Date Fair Value, Unvested as of December 31, 2019 | $ 26.93 | ||
Weighted Average Grant Date Fair Value, Granted | 12.19 | $ 27.04 | $ 36.83 |
Weighted Average Grant Date Fair Value, Forfeited | 18.39 | ||
Weighted Average Grant Date Fair Value, Vested | 19.34 | ||
Weighted Average Grant Date Fair Value, Outstanding as of December 31, 2020 | $ 15.91 | $ 26.93 |
Stockholders' Equity - Summar_2
Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
Granted, Shares | 2,641,125 | 2,535,425 | 2,998,650 |
Exercised, Shares | (268,938) | (347,716) | (1,051,180) |
2014 EIP and Inducement Plan | |||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
Outstanding, Shares, beginning balance | 6,934,262 | ||
Granted, Shares | 2,641,125 | ||
Exercised, Shares | (268,938) | ||
Forfeited or expired, Shares | (1,454,563) | ||
Outstanding, Shares, ending balance | 7,851,886 | 6,934,262 | |
Vested and expected to vest, Shares | 7,851,886 | ||
Exercisable, Shares | 3,747,718 | ||
Outstanding, Weighted Average Exercise Price, beginning balance | $ 28.25 | ||
Granted, Weighted Average Exercise Price | 12.01 | ||
Exercised, Weighted Average Exercise Price | 14.75 | ||
Forfeited or expired, Weighted Average Exercise price | 30.17 | ||
Outstanding, Weighted Average Exercise Price, ending balance | 22.89 | $ 28.25 | |
Stock options vested and expected to vest, Weighted Average Exercise Price | 22.89 | ||
Exercisable, Weighted Average Exercise Price | $ 26.74 | ||
Outstanding, Weighted Average Remaining Contractual Term | 6 years 4 months 24 days | 5 years 10 months 24 days | |
Stock options vested and expected to vest, Weighted Average Remaining Contractual Term | 6 years 4 months 24 days | ||
Exercisable, Weighted Average Remaining Contractual Term | 4 years 6 months | ||
Aggregate intrinsic value | $ 26,834 | $ 4,103 | |
Vested and expected to vest, Aggregate Intrinsic Value | 26,834 | ||
Exercisable, Aggregate Intrinsic Value | $ 6,214 |
Stockholders' Equity - Summar_3
Stockholders' Equity - Summary of Estimated Weighted-Average Assumptions (Detail) - USD ($) | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |||
Expected term (years) | 6 years | 5 years 10 months 24 days | 4 years 7 months 6 days |
Expected volatility | 76.80% | 76.10% | 73.50% |
Risk-free interest rate | 0.80% | 2.10% | 2.70% |
Expected dividend yield | 0.00% | 0.00% | 0.00% |
Weighted-average estimated grant date fair value per share | $ 7.96 | $ 18.06 | $ 22.96 |
Options granted | 2,641,125 | 2,535,425 | 2,998,650 |
Total estimated grant date fair value | $ 21,023,000 | $ 45,790,000 | $ 68,849,000 |
Stockholders' Equity - Schedule
Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance Under Equity Incentive Plans (Detail) | Dec. 31, 2020shares |
Class Of Stock [Line Items] | |
Total reserved shares of common stock | 17,130,745 |
2014 Equity Incentive Plan | |
Class Of Stock [Line Items] | |
Total reserved shares of common stock | 13,545,106 |
2018 Inducement Plan | |
Class Of Stock [Line Items] | |
Total reserved shares of common stock | 2,634,836 |
2014 Employee Stock Purchase Plan | |
Class Of Stock [Line Items] | |
Total reserved shares of common stock | 950,803 |
Stockholders' Equity - Schedu_2
Stockholders' Equity - Schedule of Stock-based Compensation Related to Stock Awards (Detail) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | |||
Total stock-based compensation expense | $ 51,351 | $ 51,696 | $ 33,817 |
Research and development | |||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | |||
Total stock-based compensation expense | 31,527 | 26,773 | 16,211 |
General and administrative | |||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | |||
Total stock-based compensation expense | $ 19,824 | $ 24,923 | $ 17,606 |
Income Taxes - Losses Before Pr
Income Taxes - Losses Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Income Tax Disclosure [Abstract] | |||
United States | $ (306,758) | $ (291,049) | $ (230,765) |
Foreign | 153 | 85 | 22 |
Loss before provision for income taxes | $ (306,605) | $ (290,964) | $ (230,743) |
Income Taxes - Components of Pr
Income Taxes - Components of Provision for (Benefit from) Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Current provision for (benefit from) income taxes: | |||
Federal | $ 0 | $ 0 | $ (31) |
State | 2 | 0 | (15) |
Foreign | 13 | 12 | 2 |
Total current provision for (benefit from) income taxes | $ 15 | $ 12 | $ (44) |
Income Taxes - Reconciliation o
Income Taxes - Reconciliation of Statutory Tax Rates to Effective Tax Rates (Detail) | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract] | |||
Federal income taxes at statutory rate | 21.00% | 21.00% | 21.00% |
Impact of stock compensation | (2.40%) | 0.10% | 0.00% |
Non-deductible executive compensation | (0.10%) | (0.70%) | (0.70%) |
Capitalized research | 0.00% | 0.00% | 7.80% |
Other | 0.30% | (0.20%) | (0.60%) |
Change in valuation allowance | (18.80%) | (20.20%) | (27.50%) |
Effective tax rate | 0.00% | 0.00% | 0.00% |
Income Taxes - Components of De
Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 |
Deferred tax assets: | ||
Net operating losses | $ 237,010 | $ 162,436 |
Stock-based compensation | 20,672 | 17,573 |
Capitalized expenses | 12,590 | 14,129 |
License fees | 8,159 | 6,870 |
Operating lease liabilities | 4,251 | 4,325 |
Legal fees | 2,136 | 1,683 |
Tax credits | 1,580 | 0 |
Other | 5,360 | 3,329 |
Total deferred tax assets | 291,758 | 210,345 |
Valuation allowance | (287,349) | (205,249) |
Total deferred tax assets | 4,409 | 5,096 |
Deferred tax liabilities: | ||
Operating lease assets | (3,541) | (3,921) |
Other | (868) | (1,175) |
Total deferred tax liabilities | (4,409) | (5,096) |
Net deferred tax assets (liabilities) | $ 0 | $ 0 |
Income Taxes - Additional Infor
Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended | |||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | |
Income Taxes [Line Items] | ||||
Increase in valuation allowance tax | $ 82,100 | $ 78,100 | ||
Net operating loss carryforwards, federal | 811,700 | |||
Net operating loss carryforwards, state | 988,100 | |||
Research and development tax credit carryforwards | $ 75,100 | |||
Research and development tax credit carryforwards, expiration year | 2035 | |||
Unrecognized tax benefits | $ 110,601 | $ 86,000 | $ 41,074 | $ 30,051 |
Unrecognized tax benefits if recognized would impact effective tax rate | 0 | |||
Domestic | ||||
Income Taxes [Line Items] | ||||
Net operating loss carryforwards subject to expiration | $ 65,300 | |||
Net tax operating losses, expiration | begin to expire in 2032 | |||
Net operating loss carryforwards not subject to expiration | $ 746,400 | |||
Research and development tax credit carryforwards | $ 12,900 | |||
Research and development tax credit carryforwards, expiration year | 2032 | |||
State | ||||
Income Taxes [Line Items] | ||||
Net operating loss carryforwards subject to expiration | $ 986,400 | |||
Net tax operating losses, expiration | begin to expire in 2030 | |||
Research and development tax credit carryforwards | $ 21,600 |
Income Taxes - Reconciliation_2
Income Taxes - Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | |
Income Tax Disclosure [Abstract] | |||
Beginning Balance | $ 86,000 | $ 41,074 | $ 30,051 |
Gross increases for tax positions related to current year | 24,648 | 22,800 | 12,927 |
Gross increases for tax positions related to prior year | 0 | 22,126 | 704 |
Gross decreases for tax positions related to prior year | (47) | 0 | (2,608) |
Ending Balance | $ 110,601 | $ 86,000 | $ 41,074 |