Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019		76,389,000
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	283,224			283,224
Other comprehensive loss, net of tax	7,680				7,680
Stock-based compensation	60,478		60,478
Issuance of common stock in connection with employee equity incentive plans (in shares)		801,000
Issuance of common stock in connection with employee equity incentive plans	22,228		22,228
Repurchase of common stock (in shares)		(1,209,000)
Repurchase of common stock	(227,895)			(227,895)
Tax withholding paid for net share settlement of equity awards (in shares)		(17,000)
Tax withholding paid for net share settlement of equity awards	(4,000)		(4,000)
Vesting of early-exercised stock options	82		82
Ending balance (in shares) at Jun. 30, 2020		75,964,000
Ending balance at Jun. 30, 2020	3,036,483	$ 8	1,185,093	1,843,559	7,823
Beginning balance (in shares) at Mar. 31, 2020		75,655,000
Beginning balance at Mar. 31, 2020	2,848,826	$ 8	1,149,224	1,698,766	828
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	144,793			144,793
Other comprehensive loss, net of tax	6,995				6,995
Stock-based compensation	32,922		32,922
Issuance of common stock in connection with employee equity incentive plans (in shares)		319,000
Issuance of common stock in connection with employee equity incentive plans	5,146		5,146
Tax withholding paid for net share settlement of equity awards (in shares)		(10,000)
Tax withholding paid for net share settlement of equity awards	(2,260)		(2,260)
Vesting of early-exercised stock options	61		61
Ending balance (in shares) at Jun. 30, 2020		75,964,000
Ending balance at Jun. 30, 2020	3,036,483	$ 8	1,185,093	1,843,559	7,823
Beginning balance (in shares) at Dec. 31, 2020		76,174,000
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	377,254			377,254
Other comprehensive loss, net of tax	(1,377)				(1,377)
Stock-based compensation	82,497		82,497
Issuance of common stock in connection with employee equity incentive plans (in shares)		878,000
Issuance of common stock in connection with employee equity incentive plans	$ 26,884		26,884
Repurchase of common stock (in shares)	(367,000)	(367,000)
Repurchase of common stock	$ (101,355)			(101,355)
Tax withholding paid for net share settlement of equity awards (in shares)		(20,000)
Tax withholding paid for net share settlement of equity awards	(6,353)		(6,353)
Ending balance (in shares) at Jun. 30, 2021		76,665,000
Ending balance at Jun. 30, 2021	3,697,841	$ 8	1,395,459	2,303,513	(1,139)
Beginning balance (in shares) at Mar. 31, 2021		76,257,000
Beginning balance at Mar. 31, 2021	3,451,338	$ 8	1,345,569	2,106,625	(864)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	196,888			196,888
Other comprehensive loss, net of tax	(275)				(275)
Stock-based compensation	44,944		44,944
Issuance of common stock in connection with employee equity incentive plans (in shares)		419,000
Issuance of common stock in connection with employee equity incentive plans	8,803		8,803
Repurchase of common stock (in shares)		0
Tax withholding paid for net share settlement of equity awards (in shares)		(11,000)
Tax withholding paid for net share settlement of equity awards	(3,857)		(3,857)
Ending balance (in shares) at Jun. 30, 2021		76,665,000
Ending balance at Jun. 30, 2021	$ 3,697,841	$ 8	$ 1,395,459	$ 2,303,513	$ (1,139)