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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 usd per share) $ 0.001 $ 0.001
Common stock (in shares) 80,000,000 80,000,000
Common stock, shares issued (in shares) 46,480,105 45,391,397
Common stock, shares outstanding (in shares) 45,776,190 44,907,818
Treasury stock (in shares) 703,915 483,579