Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options
Options outstanding, beginning balance (in shares)	4,332	5,799	6,266
Granted (in shares)	1,705	737	1,425
Exercised (in shares)	(863)	(1,683)	(1,523)
Cancelled or expired (in shares)	(392)	(521)	(369)
Options outstanding, ending balance (in shares)	4,782	4,332	5,799
Options vested and expected to vest	1,419	1,470	5,096
Options exercisable	2,564	2,280	2,901
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding, beginning balance (in dollars per share)	$ 19.78	$ 16.57	$ 12.13
Granted (in dollars per share)	48.24	31.21	29.76
Exercised (in dollars per share)	13.55	12.69	11.12
Cancelled (in dollars per share)	32.94	23.27	14.76
Options outstanding, ending balance (in dollars per share)	27.52	19.78	16.57
Options vested and expected to vest (in dollars per share)	36.41	23.88	15.29
Options exercisable (in dollars per share)	$ 17.87	$ 14.80	$ 12.03
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding	6 years 9 months 7 days	6 years 9 months 14 days	6 years 9 months 14 days
Options vested and expected to vest	8 years 7 months 9 days	8 years 2 months 8 days	6 years 5 months 26 days
Options exercisable	5 years 18 days	5 years 4 months 24 days	4 years 11 months 12 days
Aggregate Intrinsic Value
Options outstanding	$ 62,300	$ 183,825	$ 119,064
Options vested and expected to vest	11,387	56,382	110,934
Options exercisable	$ 46,932	$ 108,128	$ 72,424