Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Beginning balance (shares) at Dec. 25, 2019	35,126,582
Beginning balance at Dec. 25, 2019	$ 351	$ 330,950	$ (85,988)	$ 253	$ 245,566
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		2,170			2,170
Issuance of common stock related to restricted shares, net	$ 4	(4)
Issuance of common stock related to restricted shares, net (shares)	439,061
Issuance of common stock upon exercise of stock options	$ 10	5,836			5,846
Issuance of common stock upon exercise of stock options (shares)	965,736
Shares repurchased for employee tax withholdings		(331)			(331)
Shares repurchased for employee tax withholdings (shares)	(23,118)
Forfeiture of common stock related to restricted shares	$ (1)	1
Forfeiture of common stock related to restricted shares (shares)	(66,892)
Other comprehensive income, net of tax				(1,194)	(1,194)
Net income			19,019		19,019
Ending balance (shares) at Sep. 23, 2020	36,441,369
Ending balance at Sep. 23, 2020	$ 364	338,622	(66,969)	(941)	271,076
Beginning balance (shares) at Jun. 24, 2020	35,854,122
Beginning balance at Jun. 24, 2020	$ 359	334,088	(76,889)	(999)	256,559
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		909			909
Issuance of common stock related to restricted shares, net (shares)	2,798
Issuance of common stock upon exercise of stock options	$ 6	3,675			3,681
Issuance of common stock upon exercise of stock options (shares)	593,180
Shares repurchased for employee tax withholdings		(51)			(51)
Shares repurchased for employee tax withholdings (shares)	(2,925)
Forfeiture of common stock related to restricted shares	$ (1)	1
Forfeiture of common stock related to restricted shares (shares)	(5,806)
Other comprehensive income, net of tax				58	58
Net income			9,920		9,920
Ending balance (shares) at Sep. 23, 2020	36,441,369
Ending balance at Sep. 23, 2020	$ 364	338,622	(66,969)	(941)	271,076
Beginning balance (shares) at Dec. 30, 2020	36,423,505
Beginning balance at Dec. 30, 2020	$ 364	339,561	(61,514)	(833)	277,578
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		2,936			2,936
Issuance of common stock related to restricted shares, net	$ 2	(2)
Issuance of common stock related to restricted shares, net (shares)	206,098
Issuance of common stock upon exercise of stock options	$ 1	865			$ 866
Issuance of common stock upon exercise of stock options (shares)	132,760				132,760
Shares repurchased for employee tax withholdings		(705)			$ (705)
Shares repurchased for employee tax withholdings (shares)	(40,384)
Forfeiture of common stock related to restricted shares	$ (1)	1
Forfeiture of common stock related to restricted shares (shares)	(50,532)				(50,532)
Other comprehensive income, net of tax				300	$ 300
Net income			22,943		22,943
Ending balance (shares) at Sep. 29, 2021	36,671,447
Ending balance at Sep. 29, 2021	$ 366	342,656	(38,571)	(533)	303,918
Beginning balance (shares) at Jun. 30, 2021	36,637,761
Beginning balance at Jun. 30, 2021	$ 367	341,358	(48,732)	(607)	292,386
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		1,042			1,042
Issuance of common stock upon exercise of stock options		300			300
Issuance of common stock upon exercise of stock options (shares)	41,216
Shares repurchased for employee tax withholdings		(45)			(45)
Shares repurchased for employee tax withholdings (shares)	(2,446)
Forfeiture of common stock related to restricted shares	$ (1)	1
Forfeiture of common stock related to restricted shares (shares)	(5,084)
Other comprehensive income, net of tax				74	74
Net income			10,161		10,161
Ending balance (shares) at Sep. 29, 2021	36,671,447
Ending balance at Sep. 29, 2021	$ 366	$ 342,656	$ (38,571)	$ (533)	$ 303,918