Stockholders' Equity - Summary of Activity in Stock Option Plan (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Shares Available for Grant, Beginning Balance	476,545	741,978	505,221
Shares Available for Grant, Additional shares reserved	503,306	52,128	391,166
Shares Available for Grant, Options granted	(158,300)	(149,600)	(335,050)
Shares Available for Grant, Restricted stock granted	(62,225)	(234,012)	(66,665)
Shares Available for Grant, Options cancelled	27,957	123,679	356,277
Shares Available for Grant, Awards cancelled	79,890
Shares Available for Grant, Options expired	(13,056)	(57,628)	(108,971)
Shares Available for Grant, Ending Balance	854,117	476,545	741,978
Outstanding, Number of Shares, Beginning Balance	1,102,842	1,570,543	1,766,401
Number of Shares, Options granted	158,300	149,600	335,050
Number of Shares, Options exercised	(399,390)	(493,622)	(174,631)
Number of Shares, Options cancelled	(27,957)	(123,679)	(356,277)
Number of Shares, Ending Balance	833,795	1,102,842	1,570,543
Aggregate Price, Beginning Balance	$ 4,356	$ 5,698	$ 6,380
Aggregate Price, Options granted	1,362	851	1,313
Aggregate Price, Options exercised	(1,501)	(1,495)	(445)
Aggregate Price, Options cancelled	(171)	(698)	(1,550)
Aggregate Price, Ending Balance	$ 4,046	$ 4,356	$ 5,698
Weighted Average Exercise Price, Beginning Balance	$ 3.97	$ 3.63	$ 3.61
Weighted Average Exercise Price, Options granted	$ 8.61	$ 5.69	$ 3.92
Weighted Average Exercise Price, Options exercised	$ 3.76	$ 3.03	$ 2.55
Weighted Average Exercise Price, Options cancelled	$ 6.13	$ 5.64	$ 4.35
Weighted Average Exercise Price, Ending Balance	$ 4.88	$ 3.97	$ 3.63