Stock Based Compensation - Summary of Stock Options Outstanding, Vested and Expected to Vest and Exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 02, 2016	Jan. 02, 2016
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	510,758	551,492
Options vested and expected to vest, Number of Shares	467,617
Options exercisable, Number of Shares	229,415
Options outstanding, Weighted Average Exercise Price	$ 7.25	$ 6.92
Options vested and expected to vest, Weighted Average Exercise Price	7.14
Options exercisable, Weighted Average Exercise Price	$ 6.07
Options outstanding, Weighted Average Remaining Contractual Life (years)	4 years 8 months 27 days
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years)	4 years 7 months 21 days
Options exercisable, Weighted Average Remaining Contractual Life (years)	3 years 8 months 19 days
Options outstanding, Aggregate Intrinsic Value	$ 1,477
Options vested and expected to vest, Aggregate Intrinsic Value	1,404
Options exercisable, Aggregate Intrinsic Value	$ 923