Computation of Basic and Diluted Net Income Per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Numerator:
Net (loss) income	$ (11,713)	$ 474	$ 10,038
Denominator:
Weighted average shares of common stock (basic)	10,173	9,962	9,892
Effect of dilutive stock options		154	291
Effect of dilutive contingent shares		12	174
Weighted average shares of common stock (diluted)	10,173	10,128	10,357
Per share data:
Basic net (loss) income per share	$ (1.15)	$ 0.05	$ 1.01
Diluted net (loss) income per share	$ (1.15)	$ 0.05	$ 0.97