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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares | Sep. 30, 2020 | Dec. 31, 2019
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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

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