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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Jun. 30, 2018
Dec. 30, 2017
Condensed Consolidated Balance Sheets    
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized 250,000 250,000
Common stock, shares issued 43,350 42,707
Common stock, shares outstanding 43,350 42,707