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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
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) 45,188,169 44,570,004
Common stock, shares outstanding (in shares) 44,743,273 44,190,826
Treasury stock (in shares) 444,896 379,178