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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 30, 2018
Statement Of Financial Position [Abstract]    
Allowances on accounts receivable $ 65 $ 113
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 200,000,000 200,000,000
Common stock, outstanding 24,038,211 24,142,586
Treasury stock, shares 8,939,202 8,801,154