Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 30, 2016	Jan. 01, 2016
Current assets:
Allowance for doubtful accounts	$ 0.7	$ 1.0
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	31,059,038	30,664,119
Common stock, shares outstanding	30,925,496	30,601,167
Treasury stock, shares	133,542	62,952