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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands | Total | Common stock | Additional paid-in capital | Accumulated deficit | Accumulated other comprehensive income (loss) | Series Seed Convertible Preferred Stock | Series A Convertible Preferred Stock | Series B Convertible Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 20,000,000 | 45,714,286 | 71,506,513
Convertible preferred stock, beginning balance at Dec. 31, 2018 |  |  |  |  |  | $ 29,200 | $ 79,615 | $ 229,552
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Conversion of convertible preferred stock into common stock (in shares) |  |  |  |  |  | (20,000,000) | (45,714,286) | (71,506,513)
Conversion of convertible preferred stock into common stock |  |  |  |  |  | $ (29,200) | $ (79,615) | $ (229,552)
Convertible preferred stock, ending balance (in shares) at Mar. 31, 2019 |  |  |  |  |  | 0 | 0 | 0
Convertible preferred stock, ending balance at Mar. 31, 2019 |  |  |  |  |  | $ 0 | $ 0 | $ 0
Beginning balance (in shares) at Dec. 31, 2018 |  | 8,051,418 |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ (120,069) | $ 2 | $ 33,853 | $ (153,863) | $ (61) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs (in shares) |  | 19,837,500 |  |  |  |  |  |
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs | 291,344 | $ 2 | 291,342 |  |  |  |  |
Vesting of restricted stock (in shares) |  | 1,619,592 |  |  |  |  |  |
Stock-based compensation (in shares) |  | 27,500 |  |  |  |  |  |
Stock-based compensation | 3,089 |  | 3,089 |  |  |  |  |
Net loss | (32,611) |  |  | (32,611) |  |  |  |
Other comprehensive income | 140 |  |  |  | 140 |  |  |
Conversion of convertible preferred stock into common stock (in shares) |  | 30,493,460 |  |  |  |  |  |
Conversion of convertible preferred stock into common stock | 338,367 | $ 3 | 338,364 |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 60,029,470 |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 480,260 | $ 7 | 666,648 | (186,474) | 79 |  |  |
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 20,000,000 | 45,714,286 | 71,506,513
Convertible preferred stock, beginning balance at Dec. 31, 2018 |  |  |  |  |  | $ 29,200 | $ 79,615 | $ 229,552
Beginning balance (in shares) at Dec. 31, 2018 |  | 8,051,418 |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | (120,069) | $ 2 | 33,853 | (153,863) | (61) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss | (125,609) |  |  |  |  |  |  |
Other comprehensive income | 389 |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 60,984,958 |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 398,873 | $ 7 | 678,010 | (279,472) | 328 |  |  |
Convertible preferred stock, beginning balance (in shares) at Mar. 31, 2019 |  |  |  |  |  | 0 | 0 | 0
Convertible preferred stock, beginning balance at Mar. 31, 2019 |  |  |  |  |  | $ 0 | $ 0 | $ 0
Beginning balance (in shares) at Mar. 31, 2019 |  | 60,029,470 |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | 480,260 | $ 7 | 666,648 | (186,474) | 79 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of restricted stock (in shares) |  | 404,637 |  |  |  |  |  |
Exercise of stock option (in shares) |  | 33,273 |  |  |  |  |  |
Exercise of stock options | 86 |  | 86 |  |  |  |  |
Stock-based compensation | 5,140 |  | 5,140 |  |  |  |  |
Net loss | (44,498) |  |  | (44,498) |  |  |  |
Other comprehensive income | 417 |  |  |  | 417 |  |  |
Other additional paid-in capital | 39 |  | 39 |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 60,467,380 |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 441,444 | $ 7 | 671,913 | (230,972) | 496 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of restricted stock (in shares) |  | 404,639 |  |  |  |  |  |
Exercise of stock option (in shares) |  | 112,939 |  |  |  |  |  |
Exercise of stock options | 369 |  | 369 |  |  |  |  |
Stock-based compensation | 5,728 |  | 5,728 |  |  |  |  |
Net loss | (48,500) |  |  | (48,500) |  |  |  |
Other comprehensive income | (168) |  |  |  | (168) |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 60,984,958 |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 398,873 | $ 7 | 678,010 | (279,472) | 328 |  |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 61,635,477 |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 352,485 | $ 7 | 686,390 | (334,170) | 258 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of restricted stock (in shares) |  | 404,637 |  |  |  |  |  |
Exercise of stock option (in shares) |  | 4,309 |  |  |  |  |  |
Exercise of stock options | 15 |  | 15 |  |  |  |  |
Stock-based compensation | 8,244 |  | 8,244 | 0 |  |  |  |
Issuance of common stock pursuant to Employee Stock Purchase Plan (in shares) |  | 49,889 |  |  |  |  |  |
Issuance of common stock pursuant to Employee Stock Purchase Plan | 556 |  | 556 |  |  |  |  |
Net loss | (54,074) |  |  | (54,074) |  |  |  |
Other comprehensive income | (763) |  |  |  | (763) |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  | 62,094,000 |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 306,463 | $ 7 | 695,205 | (388,244) | (505) |  |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 61,635,477 |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | $ 352,485 | $ 7 | 686,390 | (334,170) | 258 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock option (in shares) | 76,275 |  |  |  |  |  |  |
Net loss | $ (178,756) |  |  |  |  |  |  |
Other comprehensive income | 84 |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 72,472,912 |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | 372,101 | $ 8 | 884,677 | (512,926) | 342 |  |  |
Beginning balance (in shares) at Mar. 31, 2020 |  | 62,094,000 |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | 306,463 | $ 7 | 695,205 | (388,244) | (505) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs (in shares) |  | 9,433,963 |  |  |  |  |  |
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs | 117,094 | $ 1 | 117,093 |  |  |  |  |
Equity component of convertible note issuance | 53,635 |  | 53,635 |  |  |  |  |
Debt issuance costs attributable to convertible feature | (109) |  | (109) |  |  |  |  |
Vesting of restricted stock (in shares) |  | 404,637 |  |  |  |  |  |
Exercise of stock option (in shares) |  | 39,698 |  |  |  |  |  |
Exercise of stock options | 139 |  | 139 |  |  |  |  |
Stock-based compensation (in shares) |  | 0 |  |  |  |  |  |
Stock-based compensation | 8,900 |  | 8,900 |  |  |  |  |
Net loss | (66,870) |  |  | (66,870) |  |  |  |
Other comprehensive income | 1,072 |  |  |  | 1,072 |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 71,972,610 |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | 420,324 | $ 8 | 874,863 | (455,114) | 567 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of restricted stock (in shares) |  | 404,637 |  |  |  |  |  |
Exercise of stock option (in shares) |  | 32,268 |  |  |  |  |  |
Exercise of stock options | 131 |  | 131 |  |  |  |  |
Stock-based compensation | 8,923 |  | 8,923 | 0 |  |  |  |
Issuance of common stock pursuant to Employee Stock Purchase Plan (in shares) |  | 63,397 |  |  |  |  |  |
Issuance of common stock pursuant to Employee Stock Purchase Plan | 744 |  | 744 |  |  |  |  |
Net loss | (57,812) |  |  | (57,812) |  |  |  |
Other comprehensive income | (225) |  |  |  | (225) |  |  |
Other additional paid-in capital | 16 |  | 16 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 72,472,912 |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | $ 372,101 | $ 8 | $ 884,677 | $ (512,926) | $ 342 |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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