Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019		76,389
Beginning balance at Dec. 31, 2019	$ 2,894,686	$ 8	$ 1,106,305	$ 1,788,230	$ 143
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	138,431			138,431
Other comprehensive loss, net of tax	685				685
Stock-based compensation	27,556		27,556
Issuance of common stock in connection with employee equity incentive plans (in shares)		482
Issuance of common stock in connection with employee equity incentive plans	17,082	$ 0	17,082
Tax withholding paid for net share settlement of equity awards (in shares)		(7)
Tax withholding paid for net share settlement of equity awards	(1,740)		(1,740)
Vesting of early-exercised stock options	21		21
Repurchase of common stock (in shares)		(1,209)
Repurchase of common stock	(227,895)			(227,895)
Ending balance (in shares) at Mar. 31, 2020		75,655
Ending balance at Mar. 31, 2020	2,848,826	$ 8	1,149,224	1,698,766	828
Beginning balance (in shares) at Dec. 31, 2020		76,174
Beginning balance at Dec. 31, 2020	3,320,291	$ 8	1,292,431	2,027,614	238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	180,366			180,366
Other comprehensive loss, net of tax	(1,102)				(1,102)
Stock-based compensation	37,553		37,553
Issuance of common stock in connection with employee equity incentive plans (in shares)		459
Issuance of common stock in connection with employee equity incentive plans	18,081		18,081
Tax withholding paid for net share settlement of equity awards (in shares)		(9)
Tax withholding paid for net share settlement of equity awards	$ (2,496)		(2,496)
Repurchase of common stock (in shares)	(367)	(367)
Repurchase of common stock	$ (101,355)			(101,355)
Ending balance (in shares) at Mar. 31, 2021		76,257
Ending balance at Mar. 31, 2021	$ 3,451,338	$ 8	$ 1,345,569	$ 2,106,625	$ (864)