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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Condensed Consolidated Balance Sheets    
Accounts receivable, allowance for doubtful accounts $ 153 $ 151
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 90,000,000 90,000,000
Common stock, shares issued 61,736,000 61,653,000
Common stock, shares outstanding 61,736,000 61,653,000