Stock Based Compensation - Summary of Activity under Incentive Plan (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jul. 01, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Outstanding, Number of Shares, Beginning Balance | shares	470,985
Number of Shares, Options Granted | shares	65,900
Number of Shares, Options Exercised | shares	(40,371)
Number of Shares, Options Cancelled or forfeited | shares	(27,198)
Outstanding, Number of Shares, Ending Balance | shares	469,316
Outstanding, Weighted Average Exercise Price Per Share, Beginning Balance | $ / shares	$ 8.69
Weighted Average Exercise Price Per Share, Options Granted | $ / shares	13.15
Weighted Average Exercise Price Per Share, Options Exercised | $ / shares	5.34
Weighted Average Exercise Price Per Share, Options Cancelled or forfeited | $ / shares	10.40
Outstanding, Weighted Average Exercise Price Per Share, Ending Balance | $ / shares	$ 9.51
Aggregate Intrinsic Value, Ending Balance | $	$ 768