Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2015	Dec. 30, 2014	Sep. 30, 2014	Jul. 01, 2014	Apr. 01, 2014	Oct. 01, 2013	Jul. 02, 2013	Apr. 02, 2013	Dec. 29, 2015	Dec. 30, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 117,128	$ 108,546	$ 117,328	$ 115,233	$ 105,761	$ 106,216	$ 99,459	$ 89,519	$ 455,451	$ 403,741	$ 350,924
Operating income	(6,464)	5,474	(15,302)	5,016	(4,318)	5,045	5,941	2,456	(21,067)	18,915	14,252
Net (loss) income	$ (4,254)	$ 3,535	$ (9,821)	$ 3,062	$ (2,752)	$ 2,943	$ 3,527	$ 1,424	$ (13,765)	$ 11,428	$ 6,665
Basic EPS (USD per share)	$ (0.15)	$ 0.12	$ (0.35)	$ 0.10	$ (0.09)	$ 0.10	$ 0.12	$ 0.05	$ (0.48)	$ 0.38	$ 0.25
Diluted EPS (USD per share)	$ (0.15)	$ 0.11	$ (0.35)	$ 0.10	$ (0.09)	$ 0.10	$ 0.11	$ 0.05	$ (0.48)	$ 0.37	$ 0.24