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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2020
Dec. 31, 2019
CONSOLIDATED BALANCE SHEETS    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 128,176,731 106,734,938
Common stock, shares outstanding 128,176,731 106,734,938