CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 28, 2019		75,764,990
Beginning balance at Dec. 28, 2019	$ 640,997	$ 76	$ 885,821	$ (659)	$ (244,241)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		485,566
Issuance of common stock under the Employee Stock Purchase Plan	7,875		7,875
Issuance of common stock pursuant to exercise of options (in shares)		205,769
Issuance of common stock pursuant to exercise of options	1,713	$ 1	1,712
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		927,169
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(15,382)	$ 1	(15,383)
Stock-based compensation	16,551		16,551
Other comprehensive income (loss)	3,138			3,138
Net income	59,250				59,250
Ending balance (in shares) at Sep. 26, 2020		77,383,494
Ending balance at Sep. 26, 2020	714,142	$ 78	896,576	2,479	(184,991)
Beginning balance (in shares) at Jun. 27, 2020		76,501,459
Beginning balance at Jun. 27, 2020	690,722	$ 77	898,069	458	(207,882)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		173,975
Issuance of common stock under the Employee Stock Purchase Plan	3,809	$ 0	3,809
Issuance of common stock pursuant to exercise of options (in shares)		100,000
Issuance of common stock pursuant to exercise of options	844		844
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		608,060
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(11,582)	$ 1	(11,583)
Stock-based compensation	5,437		5,437
Other comprehensive income (loss)	2,021			2,021
Net income	22,891				22,891
Ending balance (in shares) at Sep. 26, 2020		77,383,494
Ending balance at Sep. 26, 2020	714,142	$ 78	896,576	2,479	(184,991)
Beginning balance (in shares) at Dec. 26, 2020		77,437,997
Beginning balance at Dec. 26, 2020	744,084	$ 78	903,838	5,886	(165,718)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		378,584
Issuance of common stock under the Employee Stock Purchase Plan	9,809		9,809
Issuance of common stock pursuant to exercise of options (in shares)		100,000
Issuance of common stock pursuant to exercise of options	844		844
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		910,838
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(19,601)	$ 1	(19,602)
Purchase of common stock retired through repurchase program (in shares)		620,200
Purchase and retirement of common stock through repurchase program	(23,951)	$ (1)	(23,950)
Stock-based compensation	21,364		21,364
Other comprehensive income (loss)	(4,186)			(4,186)
Net income	58,027				58,027
Ending balance (in shares) at Sep. 25, 2021		78,207,219
Ending balance at Sep. 25, 2021	786,390	$ 78	892,303	1,700	(107,691)
Beginning balance (in shares) at Jun. 26, 2021		77,454,800
Beginning balance at Jun. 26, 2021	769,547	$ 77	894,062	3,596	(128,188)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		149,800
Issuance of common stock under the Employee Stock Purchase Plan	4,744		4,744
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		602,619
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(14,340)	$ 1	(14,341)
Stock-based compensation	7,838		7,838
Other comprehensive income (loss)	(1,896)			(1,896)
Net income	20,497				20,497
Ending balance (in shares) at Sep. 25, 2021		78,207,219
Ending balance at Sep. 25, 2021	$ 786,390	$ 78	$ 892,303	$ 1,700	$ (107,691)