CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Total
Balance at beginning of the period at Dec. 30, 2017	$ 815	$ 219,095	$ (296,184)	$ 43	$ (76,231)
Balance at beginning of the period (shares) at Dec. 30, 2017	81,535
Increase (decrease) in stockholders equity
Stock-based compensation		7,108			7,108
Exercise of stock options		53			53
Exercise of stock options	11
Shares withheld related to net share settlement of stock-based compensation		(57)			(57)
Shares withheld related to net share settlement of stock-based compensation (in shares)	(2)
Repurchase of common stock	$ (4)	(1,963)			(1,967)
Repurchase of common stock (shares)	(397)
Dividends			(1,214)		(1,214)
Other comprehensive (loss) income				(57)	(57)
Net income			15,564		15,564
Balance at end of the period at Jun. 30, 2018	$ 811	224,236	(281,834)	(14)	(56,801)
Balance at end of the period (shares) at Jun. 30, 2018	81,147
Balance at beginning of the period at Mar. 31, 2018	$ 811	220,138	(299,956)	38	(78,969)
Balance at beginning of the period (shares) at Mar. 31, 2018	81,147
Increase (decrease) in stockholders equity
Stock-based compensation		4,098			4,098
Dividends			(703)		(703)
Other comprehensive (loss) income				(52)	(52)
Net income			18,825		18,825
Balance at end of the period at Jun. 30, 2018	$ 811	224,236	(281,834)	(14)	(56,801)
Balance at end of the period (shares) at Jun. 30, 2018	81,147
Balance at beginning of the period at Dec. 29, 2018	$ 842	268,327	(240,104)	(94)	28,971
Balance at beginning of the period (shares) at Dec. 29, 2018	84,196
Increase (decrease) in stockholders equity
Stock-based compensation		8,286			8,286
Adoption of new accounting standard			500		500
Exercise of stock options	$ 6	2,058			2,064
Exercise of stock options	624
Dividends			(319)		(319)
Other comprehensive (loss) income				60	60
Net income			24,390		24,390
Balance at end of the period at Jun. 29, 2019	$ 848	278,671	(215,533)	(34)	63,952
Balance at end of the period (shares) at Jun. 29, 2019	84,820
Balance at beginning of the period at Mar. 30, 2019	$ 842	272,332	(237,596)	(107)	35,471
Balance at beginning of the period (shares) at Mar. 30, 2019	84,196
Increase (decrease) in stockholders equity
Stock-based compensation		4,281			4,281
Exercise of stock options	$ 6	2,058			2,064
Exercise of stock options	624
Dividends			(160)		(160)
Other comprehensive (loss) income				73	73
Net income			22,223		22,223
Balance at end of the period at Jun. 29, 2019	$ 848	$ 278,671	$ (215,533)	$ (34)	$ 63,952
Balance at end of the period (shares) at Jun. 29, 2019	84,820