Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Oct. 02, 2016	Jan. 03, 2016
Statement Of Financial Position [Abstract]
Property and equipment, at cost, less accumulated depreciation and amortization	$ 32,126	$ 25,686
Deferred charges, accumulated amortization	$ 185	$ 137
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	14,700,176	15,000,235
Common stock, shares outstanding	14,700,176	15,000,235
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0