Stock Based Compensation - Summary of Stock Options Outstanding, Vested and Expected to Vest and Exercisable (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Jan. 03, 2015
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	778,976	833,795
Options vested and expected to vest, Number of Shares	726,823
Options exercisable, Number of Shares	372,022
Options outstanding, Weighted Average Exercise Price	$ 5.65	$ 4.88
Options vested and expected to vest, Weighted Average Exercise Price	$ 5.49
Options exercisable, Weighted Average Exercise Price	$ 4.15
Options outstanding, Weighted Average Remaining Contractual Life (years)	4 years 6 months 22 days
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years)	4 years 5 months 19 days
Options exercisable, Weighted Average Remaining Contractual Life (years)	3 years 5 months 12 days
Options outstanding, Aggregate Intrinsic Value	$ 3,939
Options vested and expected to vest, Aggregate Intrinsic Value	3,787
Options exercisable, Aggregate Intrinsic Value	$ 2,437