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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 79 $ 42
Accumulated amortization on other assets $ 1,575 $ 1,420
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 24,919,624 24,784,367
Common stock, shares outstanding 21,345,159 22,012,651
Treasury stock, shares 3,574,465 2,771,716