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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2020
Dec. 31, 2019
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 125,000,000 125,000,000
Common stock, shares outstanding (in shares) 56,174,932 48,958,763