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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income (loss)	$ 35,446	$ (125,187)	$ 119,040
Income attributable to convertible preferred stock	(3,209)	0	(39,500)
Income attributable to options exercises by promissory notes	(387)	0	(1,088)
Income attributable to unvested early exercised options	(95)	0	(39)
Income attributable to unvested RSA's	(52)	0	(2,037)
Net income (loss) attributable to common stock	$ 31,703	$ (125,187)	$ 76,376
Denominator:
Weighted-average shares used in computing net income (loss) per share: Basic (in shares)	324,836,076	214,936,545	210,937,147
Net income (loss) per share attributable to common stock: Basic (in dollars per share)	$ 0.10	$ (0.58)	$ 0.36
Numerator:
Net income (loss)	$ 35,446	$ (125,187)	$ 119,040
Income attributable to convertible preferred stock	(3,058)	0	(39,329)
Income attributable to options exercises by promissory notes	(369)	0	(1,083)
Income attributable to unvested early exercised options	(91)	0	(39)
Income attributable to unvested RSA's	(49)	0	(2,028)
Net income (loss) attributable to common stock	$ 31,879	$ (125,187)	$ 76,561
Denominator:
Weighted-average shares used in computing net income (loss) per share: Basic (in shares)	324,836,076	214,936,545	210,937,147
Weighted-average dilutive stock options, RSUs, and convertible security (in shares)	17,927,556	0	1,428,282
Weighted-average shares used in computing net income (loss) per share: Diluted (in shares)	342,763,632	214,936,545	212,365,429
Net income (loss) per share attributable to common stock: Diluted (in dollars per share)	$ 0.09	$ (0.58)	$ 0.36