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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 $ 696 $ 520
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 75,000 75,000
Common stock, shares issued 40,233 40,086
Common stock, shares outstanding 40,233 40,086