Stockholders' Equity (Deficit) - Summary of Changes in Common Stock Options Issued under Existing Stock Option Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Option outstanding at beginning of period (in shares)	8,215	9,327
Option outstanding, granted (in shares)	263	1,384
Option outstanding, exercised (in shares)	(2,426)	(2,053)
Option outstanding, forfeited (in shares)	(324)	(443)
Options outstanding at ending of period (in shares)	5,728	8,215	9,327
Options outstanding, vested and expected to vest	5,490
Options outstanding, vested (in shares)	3,629
Weighted average of exercise prices at beginning of period (in dollars per share)	$ 4.30	$ 2.22
Weighted average of exercise prices, granted (in dollars per share)	58.36	14.85
Weighted average of exercise prices, exercised (in dollars per share)	2.46	2.25
Weighted average of exercise prices, forfeited (in dollars per share)	11.22	5.33
Weighted average of exercise prices at end of period (in dollars per share)	8.77	$ 4.30	$ 2.22
Weighted average of exercise prices, vested and expected to vest (in dollars per share)	6.71
Weighted average of exercise prices, vested (in dollars per share)	$ 3.53
Weighted average of remaining term (years)	6 years 11 months 12 days	7 years 7 months 24 days	8 years 2 months 1 day
Weighted average of remaining term, vested and expected to vest at December 31, 2021 (years)	6 years 10 months 28 days
Weighted average of remaining term, vested at December 31, 2021 (years)	6 years 5 months 15 days
Aggregate intrinsic value, options outstanding	$ 168,772	$ 491,648	$ 65,294
Aggregate intrinsic value, vested and expected to vest at December 31, 2021	164,384
Aggregate intrinsic value, vested at December 31, 2021	$ 116,440