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
Jun. 30, 2018
Dec. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable allowance for doubtful accounts $ 1,014 $ 1,568
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 170,000,000 170,000,000
Common stock, shares issued 19,715,605 19,360,026
Common stock, shares outstanding 18,486,758 17,946,386
Treasury stock at par 1,228,847 1,413,640