Unaudited Condensed Consolidated Statements of Stockholder's Equity - USD ($) $ 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		31,562,000
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	17			17
Net income (loss)	12,843				12,843
Stock-based compensation	6,457		6,457
Repurchase of common stock	$ (15,000)				(15,000)
Repurchase of common stock (in shares)	(400,000)	(436,000)
Restricted stock unit withholdings	$ (3,344)				(3,344)
Restricted stock unit withholdings (in shares)	(89,000)	(89,000)
Issuance of common stock under stock-based compensation plans	$ 4,371		4,371
Issuance of common stock under stock-based compensation plans (in shares)		430,000
Ending balance at Mar. 31, 2019	632,908	$ 32	804,413	14	(171,551)
Ending balance (in shares) at Mar. 31, 2019		31,467,000
Beginning balance at Dec. 31, 2019	608,693	$ 30	831,365	21	(222,723)
Beginning balance (in shares) at Dec. 31, 2019		29,925,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in unrealized gains and losses on derivatives, net of tax	350			350
Net income (loss)	(4,173)				(4,173)
Stock-based compensation	6,336		6,336
Repurchase of common stock	$ (15,008)				(15,008)
Repurchase of common stock (in shares)	(600,000)	(584,000)
Restricted stock unit withholdings	$ (1,347)				(1,347)
Restricted stock unit withholdings (in shares)	(54,000)	(54,000)
Issuance of common stock under stock-based compensation plans	$ 2,940		2,940
Issuance of common stock under stock-based compensation plans (in shares)		305,000
Ending balance at Mar. 29, 2020	$ 597,791	$ 30	$ 840,641	$ 371	$ (243,251)
Ending balance (in shares) at Mar. 29, 2020		29,592,000