Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 440 $ 395
Common stock, par value (in dollars per share)
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 19,046,000 18,919,000
Common stock, shares outstanding (in shares) 19,046,000 18,919,000