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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 280,000,000 280,000,000
Common stock, shares issued 206,407,551 187,029,967
Common stock, shares outstanding 206,407,551 187,029,967