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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
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) 40,639,837 40,474,085
Common stock, shares outstanding (in shares) 40,529,182 40,393,033
Treasury stock, shares (in shares) 110,655 81,052