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CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | IPO | Follow-On Public Offering | Redeemable Convertible Preferred Stock | Common Stock | Common Stock Restricted Stock Units | Common Stock IPO | Common Stock Follow-On Public Offering | Additional Paid-in Capital | Additional Paid-in Capital IPO | Additional Paid-in Capital Follow-On Public Offering | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Temporary Equity, Balance at Dec. 31, 2017 |  |  |  |  | $ 360,165 |  |  |  |  |  |  |  |  |
Temporary Equity, Balance, shares at Dec. 31, 2017 |  |  |  |  | 50,545,260 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ (201,499) | $ 1,658 |  |  |  | $ 8 |  |  |  |  |  |  | $ (201,507) | $ 1,658
Balance (in shares) at Dec. 31, 2017 |  |  |  |  |  | 8,522,110 |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201409Member |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ 1,158 |  |  |  |  |  |  |  |  | $ 1,158 |  |  |  |
Exercise of stock options | 31 |  |  |  |  |  |  |  |  | 31 |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  | 12,502 |  |  |  |  |  |  |  |
Vesting of restricted stock awards/units (in shares) |  |  |  |  |  | 36,774 |  |  |  |  |  |  |  |
Issuance of Series G redeemable convertible preferred stock, net of issuance costs |  |  |  |  | $ 145,899 |  |  |  |  |  |  |  |  |
Issuance of Series G redeemable convertible preferred stock, net of issuance costs, shares |  |  |  |  | 16,280,040 |  |  |  |  |  |  |  |  |
Accretion of redeemable convertible preferred stock | (13,036) |  |  |  |  |  |  |  |  | (1,189) |  |  | (11,847) |
Temporary equity, Accretion of redeemable convertible preferred stock |  |  |  |  | $ 13,036 |  |  |  |  |  |  |  |  |
Net loss | (85,178) |  |  |  |  |  |  |  |  |  |  |  | (85,178) |
Temporary Equity, Balance at Dec. 31, 2018 |  |  |  |  | $ 519,100 |  |  |  |  |  |  |  |  |
Temporary Equity, Balance, shares at Dec. 31, 2018 |  |  |  |  | 66,825,300 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | (296,866) |  |  |  |  | $ 8 |  |  |  |  |  |  | (296,874) |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 8,571,386 |  |  |  |  |  |  |  |
Stock-based compensation | 2,756 |  |  |  |  |  |  |  |  | 2,756 |  |  |  |
Exercise of stock options | 466 |  |  |  |  |  |  |  |  | 466 |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  | 135,950 |  |  |  |  |  |  |  |
Vesting of restricted stock awards/units | 1,344 |  |  |  |  |  |  |  |  | 1,344 |  |  |  |
Vesting of restricted stock awards/units (in shares) |  |  |  |  |  | 623,832 |  |  |  |  |  |  |  |
Repurchase of common stock | (5,824) |  |  |  |  |  |  |  |  | (4,566) |  |  | (1,258) |
Repurchase of common stock (in shares) |  |  |  |  |  | (680,246) |  |  |  |  |  |  |  |
Issuance of Series H redeemable convertible preferred stock, net of issuance costs |  |  |  |  | $ 222,482 |  |  |  |  |  |  |  |  |
Issuance of Series H redeemable convertible preferred stock, net of issuance costs, shares |  |  |  |  | 16,743,328 |  |  |  |  |  |  |  |  |
Accretion of redeemable convertible preferred stock | (132,750) |  |  |  |  |  |  |  |  |  |  |  | (132,750) |
Temporary equity, Accretion of redeemable convertible preferred stock | 132,800 |  |  |  | $ 132,750 |  |  |  |  |  |  |  |  |
Net loss | (142,978) |  |  |  |  |  |  |  |  |  |  |  | (142,978) |
Temporary Equity, Balance at Dec. 31, 2019 | $ 874,332 |  |  |  | $ 874,332 |  |  |  |  |  |  |  |  |
Temporary Equity, Balance, shares at Dec. 31, 2019 | 83,568,628 |  |  |  | 83,568,628 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ (573,852) |  |  |  |  | $ 8 |  |  |  |  |  |  | (573,860) |
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  | 8,650,922 |  |  |  |  |  |  |  |
Issuance of common stock, net of offering costs | 2,127 |  | $ 496,510 | $ 567,952 |  |  |  | $ 24 | $ 11 | 2,127 | $ 496,486 | $ 567,941 |  |
Issuance of common stock, net of offering costs (in shares) |  |  |  |  |  | 183,870 |  | 24,437,500 | 10,800,000 |  |  |  |  |
Conversion of redeemable convertible preferred stock to common stock | 901,046 |  |  |  |  | $ 86 |  |  |  | 900,960 |  |  |  |
Temporary equity, Conversion of redeemable convertible preferred stock to common stock (in shares) |  |  |  |  | (85,533,394) |  |  |  |  |  |  |  |  |
Temporary equity, Conversion of redeemable convertible preferred stock to common stock |  |  |  |  | $ (901,046) |  |  |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock to common stock (in shares) |  |  |  |  |  | 85,533,394 |  |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock warrant to common stock warrant | 21,873 |  |  |  |  |  |  |  |  | 21,873 |  |  |  |
Stock-based compensation | 13,254 |  |  |  |  |  |  |  |  | 13,254 |  |  |  |
Exercise of stock options | $ 2,341 |  |  |  |  | $ 1 |  |  |  | 2,340 |  |  |  |
Exercise of stock options (in shares) | 598,406 |  |  |  |  | 598,406 |  |  |  |  |  |  |  |
Exercise of common stock warrants (in shares) |  |  |  |  |  | 636,112 |  |  |  |  |  |  |  |
Vesting of restricted stock awards/units | $ 3,383 |  |  |  |  | $ 2 |  |  |  | 3,381 |  |  |  |
Vesting of restricted stock awards/units (in shares) |  |  |  |  |  | 3,249,346 | 237,334 |  |  |  |  |  |  |
Repurchase of common stock | (1,818) |  |  |  |  |  |  |  |  | (606) |  |  | (1,212) |
Repurchase of common stock (in shares) |  |  |  |  |  | (200,000) |  |  |  |  |  |  |  |
Issuance of Series H redeemable convertible preferred stock, net of issuance costs |  |  |  |  | $ 26,714 |  |  |  |  |  |  |  |  |
Issuance of Series H redeemable convertible preferred stock, net of issuance costs, shares |  |  |  |  | 1,964,766 |  |  |  |  |  |  |  |  |
Common stock shares withheld to satisfy employee tax withholding obligations | (2,915) |  |  |  |  |  |  |  |  | (2,915) |  |  |  |
Common stock shares withheld to satisfy employee tax withholding obligations (in shares) |  |  |  |  |  | (82,915) |  |  |  |  |  |  |  |
Net loss | $ (202,799) |  |  |  |  |  |  |  |  |  |  |  | (202,799) |
Temporary Equity, Balance, shares at Dec. 31, 2020 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2020 | $ 1,227,102 |  |  |  |  | $ 132 |  |  |  | $ 2,004,841 |  |  | $ (777,871) |
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  | 134,043,969 |  |  |  |  |  |  |  |

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