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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares | Jun. 30, 2021 | Dec. 31, 2020
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Statement Of Financial Position [Abstract] |  |
Undesignated preferred stock, par value | $ 0.01 | $ 0.01
Undesignated preferred stock, shares authorized | 10,000,000 | 10,000,000
Undesignated preferred stock, shares issued | 0 | 0
Undesignated preferred stock, shares outstanding | 0 | 0
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 400,000,000 | 400,000,000
Common stock, shares issued | 249,617,550 | 242,117,089
Common stock, shares outstanding | 249,617,550 | 242,117,089

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