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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
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 249,072,677 242,117,089
Common stock, shares outstanding 249,072,677 242,117,089