Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 27, 2019	$ 137,614	$ 58	$ 303,707	$ (141,887)	$ (13,714)	$ (10,550)
Balance, Shares at Dec. 27, 2019		57,181		(27,425)
Issuance of common stock	(1,962)		(1,962)
Issuance of common stock, Shares		291
Treasury stock purchased	(1,006)			$ (1,006)
Treasury stock purchased, Shares				(73)
Amortization of restricted stock units and common stock subject to vesting requirements	2,469		2,469
Dividends declared	(13)				(13)
Net income	5,527				5,527
Foreign currency translation	(1,830)					(1,830)
Balance at Mar. 27, 2020	140,799	$ 58	304,214	$ (142,893)	(8,200)	(12,380)
Ending Balance, Shares at Mar. 27, 2020		57,472		(27,498)
Balance at Jan. 01, 2021	140,887	$ 58	312,039	$ (144,254)	(17,388)	(9,568)
Balance, Shares at Jan. 01, 2021		57,693		(27,609)
Issuance of common stock	(1,605)		(1,605)
Issuance of common stock, Shares		294
Treasury stock purchased	(2,110)			$ (2,110)
Treasury stock purchased, Shares				(136)
Amortization of restricted stock units and common stock subject to vesting requirements	2,633		2,633
Dividends declared	(3,254)				(3,254)
Net income	6,361				6,361
Foreign currency translation	269					269
Balance at Apr. 02, 2021	$ 143,181	$ 58	$ 313,067	$ (146,364)	$ (14,281)	$ (9,299)
Ending Balance, Shares at Apr. 02, 2021		57,987		(27,745)