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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for sales returns and doubtful accounts $ 528 $ 449
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 20,000,000 20,000,000
Common stock, issued 12,124,000 12,027,000
Common stock, outstanding 11,930,000 11,871,000