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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, net of allowance for doubtful accounts $ 3,213 $ 2,654
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 14,086,000 14,086,000
Common stock, shares outstanding (in shares) 13,760,000 13,760,000