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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jul. 01, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 62 $ 79
Accumulated amortization on other assets $ 1,622 $ 1,575
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 25,081,337 24,919,624
Common stock, shares outstanding 21,431,124 21,345,159
Treasury stock, shares 3,650,213 3,574,465