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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 454 $ 460
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 19,302,000 19,204,000
Common stock, shares outstanding (in shares) 19,302,000 19,204,000