Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2018	$ 627,552	$ 32	$ 793,585	$ (15)	$ (166,050)
Beginning balance (in shares) at Dec. 31, 2018		31,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in unrealized gains and losses on available-for-sale investments, net of tax	12			12
Change in unrealized gains and losses on derivatives, net of tax	24			24
Net income	25,791				25,791
Stock-based compensation	29,137		29,137
Repurchase of common stock	$ (75,946)	$ (3)			(75,943)
Repurchase of common stock (in shares)	(2,400)	(2,406)
Restricted stock unit withholdings	$ (6,521)				(6,521)
Restricted stock unit withholdings (in shares)	(198)	(198)
Issuance of common stock under stock-based compensation plans	$ 8,644	$ 1	8,643
Issuance of common stock under stock-based compensation plans (in shares)		967
Ending balance at Dec. 31, 2019	608,693	$ 30	831,365	21	(222,723)
Ending balance (in shares) at Dec. 31, 2019		29,925
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in unrealized gains and losses on derivatives, net of tax	(56)			(56)
Net income	58,293				58,293
Stock-based compensation	30,505		30,505
Repurchase of common stock	$ (23,801)	$ (1)			(23,800)
Repurchase of common stock (in shares)	(900)	(942)
Restricted stock unit withholdings	$ (5,090)				(5,090)
Restricted stock unit withholdings (in shares)	(198)	(198)
Issuance of common stock under stock-based compensation plans	$ 20,840	$ 1	20,839
Issuance of common stock under stock-based compensation plans (in shares)		1,614
Ending balance at Dec. 31, 2020	689,384	$ 30	882,709	(35)	(193,320)
Ending balance (in shares) at Dec. 31, 2020		30,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in unrealized gains and losses on derivatives, net of tax	184			184
Net income	49,387				49,387
Stock-based compensation	25,995		25,995
Repurchase of common stock	$ (75,000)	$ (2)			(74,998)
Repurchase of common stock (in shares)	(2,100)	(2,146)
Restricted stock unit withholdings	$ (7,660)				(7,660)
Restricted stock unit withholdings (in shares)	(204)	(204)
Issuance of common stock under stock-based compensation plans	$ 14,525	$ 1	14,524
Issuance of common stock under stock-based compensation plans (in shares)		1,237
Ending balance at Dec. 31, 2021	$ 696,815	$ 29	$ 923,228	$ 149	$ (226,591)
Ending balance (in shares) at Dec. 31, 2021		29,286