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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Condensed Consolidated Balance Sheets [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 32 $ 32
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 90,000,000 90,000,000
Common stock, shares issued 35,039,000 34,586,000
Common stock, shares outstanding 35,039,000 34,586,000