Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jan. 01, 2016	Jan. 02, 2015
Current assets:
Allowance for doubtful accounts	$ 1.0	$ 1.4
Stockholders’ equity:
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	30,664,119	25,099,293
Common stock, shares outstanding	30,601,167	25,070,931
Treasury stock, shares	62,952	28,362