CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income/ (Loss) [Member]	Accumulated Earnings / (Deficit) [Member]
Balance at Dec. 31, 2017	$ 333,154	$ 32	$ 386,196	$ (1,205)	$ (51,869)
Balance, Shares at Dec. 31, 2017		25,416,000
Issuance of shares through share-based compensation plans, net	624		624
Issuance of shares through share-based compensation plans, net, Shares		358,000
Repurchase of common stock	(21,069)	$ (1)	(21,068)
Repurchase of common stock, Shares		(853,000)
Net income	45,096				45,096
Share-based compensation	6,062		6,062
Share-based compensation plan withholdings	(1,921)		(1,921)
Share-based compensation plan withholdings, Shares		(66,000)
Currency translation	(194)			(194)
Unrealized gain (loss) on investments	136			136
Balance at Dec. 31, 2018	361,888	$ 31	369,893	(1,263)	(6,773)
Balance, shares at Dec. 31, 2018		24,855,000
Effect of merger	890,131	$ 19	890,112
Effect of merger, Shares		25,060,000
Issuance of shares through share-based compensation plans, net	2,131		2,131
Issuance of shares through share-based compensation plans, net, Shares		377,000
Repurchase of common stock	(744)		(744)
Repurchase of common stock, Shares		(30,000)
Net income	1,910				1,910
Share-based compensation	10,585		10,585
Share-based compensation plan withholdings	(2,540)		(2,540)
Share-based compensation plan withholdings, Shares		(78,000)
Currency translation	709			709
Unrealized gain (loss) on investments	(44)			(44)
Balance at Dec. 31, 2019	$ 1,264,026	$ 50	1,269,437	(598)	(4,863)
Balance, shares at Dec. 31, 2019	50,184,000	50,184,000
Issuance of shares through share-based compensation plans, net	$ 2,919	$ 1	2,918
Issuance of shares through share-based compensation plans, net, Shares		668,000
Repurchase of common stock	(52,000)	$ (2)	(51,998)
Repurchase of common stock, Shares		(1,882,000)
Net income	31,025				31,025
Share-based compensation	17,662		17,662
Share-based compensation plan withholdings	(4,052)		(4,052)
Share-based compensation plan withholdings, Shares		(118,000)
Other, Shares		(94,000)
Currency translation	5,043			5,043
Unrealized gain (loss) on investments	123			123
Balance at Dec. 26, 2020	$ 1,264,746	$ 49	$ 1,233,967	$ 4,568	$ 26,162
Balance, shares at Dec. 26, 2020	48,758,000	48,758,000