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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Undesignated preferred stock, par value $ 0.01 $ 0.01
Undesignated preferred stock, shares authorized 10,000,000 10,000,000
Undesignated preferred stock, shares issued 0 0
Undesignated preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 140,000,000 140,000,000
Common stock, shares issued 104,707,116 95,680,831
Common stock, shares outstanding 104,707,116 95,680,831