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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2021
Dec. 31, 2020
Stockholders' equity    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 138,022,940 127,810,064
Common stock, shares outstanding (in shares) 138,022,940 127,810,064