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Condensed Consolidated Statement of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands | Total | Convertible Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ (111,108) |  | $ 1 | $ 18,108 | $ 454 | $ (129,671)
Beginning balance, (in shares) at Dec. 31, 2019 |  | 152,116,000 |  |  |  |
Beginning balance at Dec. 31, 2019 |  | $ 519,163 |  |  |  |
Beginning balance, (in shares) at Dec. 31, 2019 |  |  | 11,181,000 |  |  |
Issuance of Series C convertible preferred stock |  | $ 492,467 |  |  |  |
Issuance of Series C convertible preferred stock, shares |  | 42,905,000 |  |  |  |
Issuance of common stock to strategic partners | 1,004 |  |  | 1,004 |  |
Issuance of common stock to strategic partners, shares |  |  | 275,000 |  |  |
Issuance of common stock for asset acquisition | 4,000 |  |  | 4,000 |  |
Issuance of common stock for asset acquisition, shares |  |  | 688,000 |  |  |
Repurchase of convertible preferred stock | (3,582) | $ (662) |  | (3,582) |  |
Repurchase of convertible preferred stock, shares |  | (547,000) |  |  |  |
Issuance of common stock upon exercise of stock options | 35 |  |  | 35 |  |
Issuance of common stock upon exercise of stock options, shares |  |  | 15,000 |  |  |
Repurchase of common stock | (11,806) |  |  | (11,806) |  |
Repurchase of common stock, shares |  |  | (2,032,000) |  |  |
Stock-based compensation | 20,290 |  |  | 20,290 |  |
Stock-based compensation, shares |  |  | 4,177,000 |  |  |
Other comprehensive income | 139 |  |  |  | 139 |
Net loss | (165,615) |  |  |  |  | (165,615)
Ending balance at Sep. 30, 2020 | (266,643) |  | $ 1 | 28,049 | 593 | (295,286)
Ending balance, (in shares) at Sep. 30, 2020 |  | 194,474,000 |  |  |  |
Ending balance at Sep. 30, 2020 |  | $ 1,010,968 |  |  |  |
Ending balance, (in shares) at Sep. 30, 2020 |  |  | 14,304,000 |  |  |
Beginning balance at Jun. 30, 2020 | (240,109) |  | $ 1 | 18,266 | 1,191 | (259,567)
Beginning balance, (in shares) at Jun. 30, 2020 |  | 194,474,000 |  |  |  |
Beginning balance at Jun. 30, 2020 |  | $ 1,010,968 |  |  |  |
Beginning balance, (in shares) at Jun. 30, 2020 |  |  | 13,097,000 |  |  |
Stock-based compensation | 9,783 |  |  | 9,783 |  |
Stock-based compensation, shares |  |  | 1,207,000 |  |  |
Other comprehensive income | (598) |  |  |  | (598) |
Net loss | (35,719) |  |  |  |  | (35,719)
Ending balance at Sep. 30, 2020 | (266,643) |  | $ 1 | 28,049 | 593 | (295,286)
Ending balance, (in shares) at Sep. 30, 2020 |  | 194,474,000 |  |  |  |
Ending balance at Sep. 30, 2020 |  | $ 1,010,968 |  |  |  |
Ending balance, (in shares) at Sep. 30, 2020 |  |  | 14,304,000 |  |  |
Beginning balance at Dec. 31, 2020 | $ (292,528) |  | $ 2 | 41,357 | 256 | (334,143)
Beginning balance, (in shares) at Dec. 31, 2020 | 194,474,000 | 194,474,000 |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 1,010,968 | $ 1,010,968 |  |  |  |
Beginning balance, (in shares) at Dec. 31, 2020 | 15,570,000 |  | 15,570,000 |  |  |
Proceeds from initial public offering, net of issuance costs, Shares |  |  | 25,000,000 |  |  |
Proceeds from initial public offering, net of issuance costs | $ 391,802 |  | $ 2 | 391,800 |  |
Conversion of convertible preferred stock to common stock, Shares |  | 194,474,000 | 194,474,000 |  |  |
Conversion of convertible preferred stock to common stock | 1,010,968 | $ (1,010,968) | $ 20 | 1,010,948 |  |
Issuance of common stock upon exercise of stock options | $ 2,043 |  |  | 2,043 |  |
Issuance of common stock upon exercise of stock options, shares | 776,449 |  | 776,000 |  |  |
Stock-based compensation | $ 41,023 |  |  | 41,023 |  |
Stock-based compensation, shares |  |  | 3,969,000 |  |  |
Other comprehensive income | (321) |  |  |  | (321) |
Net loss | (166,513) |  |  |  |  | (166,513)
Ending balance at Sep. 30, 2021 | $ 986,474 |  | $ 24 | 1,487,171 | (65) | (500,656)
Ending balance, (in shares) at Sep. 30, 2021 | 0 |  |  |  |  |
Ending balance at Sep. 30, 2021 | $ 0 |  |  |  |  |
Ending balance, (in shares) at Sep. 30, 2021 | 239,789,000 |  | 239,789,000 |  |  |
Beginning balance at Jun. 30, 2021 | $ 1,021,955 |  | $ 24 | 1,473,639 | 73 | (451,781)
Beginning balance, (in shares) at Jun. 30, 2021 |  |  | 238,549,000 |  |  |
Initial public offering costs | (39) |  |  | (39) |  |
Issuance of common stock upon exercise of stock options | 529 |  |  | 529 |  |
Issuance of common stock upon exercise of stock options, shares |  |  | 265,000 |  |  |
Stock-based compensation | 13,042 |  |  | 13,042 |  |
Stock-based compensation, shares |  |  | 975,000 |  |  |
Other comprehensive income | (138) |  |  |  | (138) |
Net loss | (48,875) |  |  |  |  | (48,875)
Ending balance at Sep. 30, 2021 | $ 986,474 |  | $ 24 | $ 1,487,171 | $ (65) | $ (500,656)
Ending balance, (in shares) at Sep. 30, 2021 | 0 |  |  |  |  |
Ending balance at Sep. 30, 2021 | $ 0 |  |  |  |  |
Ending balance, (in shares) at Sep. 30, 2021 | 239,789,000 |  | 239,789,000 |  |  |

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