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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 350,000,000 350,000,000
Common stock, shares issued (in shares) 40,949,849 40,673,513
Common stock, shares outstanding (in shares) 40,209,409 39,974,478
Treasury stock, shares (in shares) 740,440 699,035