CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	$ 28,971	$ 500	$ 842	$ 268,327	$ (240,104)	$ 500	$ (94)
Balance at beginning of the period at Dec. 29, 2018	28,971	500	$ 842	268,327	(240,104)	500	(94)
Balance at beginning of the period (shares) at Dec. 29, 2018			84,196
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	4,005			4,005
Shares withheld related to net share settlement of stock-based compensation (in shares)			(22)
Other comprehensive loss	(13)						(13)
Net income	2,167				2,167
Adoption of new accounting standard	35,471	$ 500	$ 842	272,332	(237,596)	$ 500	(107)
Dividends	(159)				(159)
Balance at end of the period at Mar. 30, 2019	35,471		$ 842	272,332	(237,596)		(107)
Balance at end of the period (shares) at Mar. 30, 2019			84,196
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	35,471		$ 842	272,332	(237,596)		(107)
Adoption of new accounting standard	122,005		868	310,678	(189,545)		4
Balance at beginning of the period at Dec. 28, 2019	122,005		$ 868	310,678	(189,545)		4
Balance at beginning of the period (shares) at Dec. 28, 2019			86,774
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,855			1,855
Exercise of stock options	165		$ 1	164
Exercise of stock options (in shares)			143
Shares withheld related to net share settlement of stock-based compensation	(704)			(704)
Other comprehensive loss	(154)						(154)
Net income	8,480		$ 0	0	8,480		0
Adoption of new accounting standard	131,647		869	311,993	(181,065)		(150)
Balance at end of the period at Mar. 28, 2020	131,647		$ 869	311,993	(181,065)		(150)
Balance at end of the period (shares) at Mar. 28, 2020			86,895
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	$ 131,647		$ 869	$ 311,993	$ (181,065)		$ (150)