Stockholders' Equity - Stock Options Outstanding, Exercisable and Expected to Vest (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	551,492	833,795	1,102,842	1,570,543
Options outstanding, Weighted Average Exercise Price	$ 6.92	$ 4.88	$ 3.97	$ 3.63
Options outstanding, Weighted Average Remaining Contractual Life (years)	4 years 8 months 5 days
Options outstanding, Aggregate Intrinsic Value	$ 1,422
Options vested and expected to vest, Number of Shares	511,414
Options vested and expected to vest, Weighted Average Exercise Price	$ 6.82
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years)	4 years 6 months 29 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 1,366
Options exercisable, Number of Shares	253,209
Options exercisable, Weighted Average Exercise Price	$ 5.68
Options exercisable, Weighted Average Remaining Contractual Life (years)	3 years 6 months 22 days
Options exercisable, Aggregate Intrinsic Value	$ 937