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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 28, 2018
Dec. 29, 2017
Current assets:    
Allowance for doubtful accounts $ 0.6 $ 0.5
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 32,624,494 31,977,953
Common stock, shares outstanding 32,473,167 31,871,427
Treasury stock, shares 151,327 106,526