Stock Based Compensation - Summary of Stock Options Outstanding, Vested, Expected to Vest and Exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 30, 2017
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	867,548	857,311
Options vested and expected to vest, Number of Shares	798,665
Options exercisable, Number of Shares	272,540
Options outstanding, Weighted Average Exercise Price	$ 9.31	$ 9.49
Options vested and expected to vest, Weighted Average Exercise Price	9.29
Options exercisable, Weighted Average Exercise Price	$ 8.45
Options outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 3 months
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	5 years 1 month 28 days
Options exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 1 month 20 days
Options outstanding, Aggregate Intrinsic Value	$ 78
Options vested and expected to vest, Aggregate Intrinsic Value	78
Options exercisable, Aggregate Intrinsic Value	$ 78