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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 98  
Accounts receivable, allowance for sales returns and doubtful accounts   $ 597
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 20,000,000 20,000,000
Common stock, issued 12,139,000 12,103,000
Common stock, outstanding 12,063,000 11,971,000
Treasury Stock, Common, Shares 9,000