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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 1,377 $ 950
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 750,000,000 750,000,000
Common stock, shares outstanding (in shares) 81,879,170 81,202,437
Treasury stock, at cost (in shares) 2,648,823 448,661