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Net Income (Loss) Per Share - Summary of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net income (loss) $ 178 $ 14,423 $ (10,521) $ (89,688) $ (21,391) $ 4,664 $ 4,080 $ (106,415) $ (125,187) $ 119,040 $ (259,995)
Income attributable to convertible preferred stock 0     0     (499) 0 0 (39,500) 0
Income attributable to options exercises by promissory notes (1)     0     (49) 0 0 (1,088) 0
Income attributable to unvested early exercised options 0     0     (13) 0 0 (39) 0
Income attributable to unvested RSA's 0     0     (7) 0 0 (2,037) 0
Net income (loss) attributable to common stock $ 177     $ (89,688)     $ 3,512 $ (106,415) $ (125,187) $ 76,376 $ (259,995)
Denominator:                      
Weighted-average shares used in computing net income (loss) per share: Basic 368,427,532     214,638,272     309,353,304 212,998,263 214,936,545 210,937,147 189,533,630
Net income (loss) per share attributable to common stock: Basic $ 0.00     $ (0.42)     $ 0.01 $ (0.50) $ (0.58) $ 0.36 $ (1.37)
Numerator:                      
Net income (loss) $ 178 $ 14,423 $ (10,521) $ (89,688) $ (21,391) $ 4,664 $ 4,080 $ (106,415) $ (125,187) $ 119,040 $ (259,995)
Income attributable to convertible preferred stock 0     0     (475) 0 0 (39,329) 0
Income attributable to options exercises by promissory notes (1)     0     (47) 0 0 (1,083) 0
Income attributable to unvested early exercised options 0     0     (12) 0 0 (39) 0
Income attributable to unvested RSA's 0     0     (7) 0 0 (2,028) 0
Net income (loss) attributable to common stock $ 177     $ (89,688)     $ 3,539 $ (106,415) $ (125,187) $ 76,561 $ (259,995)
Denominator:                      
Weighted-average shares used in computing net income (loss) per share: Basic 368,427,532     214,638,272     309,353,304 212,998,263 214,936,545 210,937,147 189,533,630
Weighted-average dilutive stock options 15,897,253     0     18,073,488   0 1,428,282 0
Weighted-average shares used in computing net income (loss) per share: Diluted 384,324,785     214,638,272     327,426,792 212,998,263 214,936,545 212,365,429 189,533,630
Net income (loss) per share attributable to common stock: Diluted $ 0.00     $ (0.42)     $ 0.01 $ (0.50) $ (0.58) $ 0.36 $ (1.37)