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Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Preferred stock, par value (in USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100,000,000 100,000,000
Preferred stock, shares issued (in shares) 160,600 151,700
Preferred stock, shares outstanding (in shares) 160,600 151,700
Common stock, par value (in USD per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 650,000,000 650,000,000
Common stock, shares issued (in shares) 175,048,260 174,581,742
Common stock, shares outstanding (in shares) 175,048,260 174,581,742