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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 175,000,000 175,000,000
Common stock, shares issued (in shares) 54,371,701 54,007,708
Common stock, shares outstanding (in shares) 52,941,607 53,629,439
Treasury stock, shares (in shares) 1,430,094 378,269