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. 01, 2017	Dec. 31, 2016
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	478,538	470,985
Options vested and expected to vest, Number of Shares	450,850
Options exercisable, Number of Shares	237,456
Options outstanding, Weighted Average Exercise Price	$ 9.31	$ 8.69
Options vested and expected to vest, Weighted Average Exercise Price	9.12
Options exercisable, Weighted Average Exercise Price	$ 7.05
Options outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 6 months 7 days
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	4 years 5 months 9 days
Options exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 7 months 17 days
Options outstanding, Aggregate Intrinsic Value	$ 1,528
Options vested and expected to vest, Aggregate Intrinsic Value	1,498
Options exercisable, Aggregate Intrinsic Value	$ 1,150