Stock Based Compensation - Summary of Activity in Stock Option Plan (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Outstanding, Number of Shares, Beginning Balance	833,795
Number of Shares, Options Granted	78,300
Number of Shares, Options Exercised	(126,119)
Number of Shares, Options Cancelled or forfeited	(7,000)
Outstanding, Number of Shares, Ending Balance	778,976
Weighted Average Exercise Price Per Share, Beginning Balance	$ 4.88
Weighted Average Exercise Price Per Share , Options Granted	$ 10.73
Weighted Average Exercise Price Per Share, Options Exercised	$ 3.86
Weighted Average Exercise Price Per Share, Options Cancelled or forfeited	$ 3.35
Weighted Average Exercise Price Per Share, Ending Balance	$ 5.65
Aggregate Intrinsic Value, Ending Balance	$ 3,939