Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jan. 02, 2016	Jan. 03, 2015
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 140	$ 223
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, shares authorized	2,000,000	2,000,000
Convertible preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	10,009,408	9,786,695
Common stock, shares outstanding	10,009,408	9,786,695