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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Preferred Stock    
Preferred stock, shares authorized (in shares) 50,000,000  
Preferred stock, shares outstanding (in shares) 2,000,000  
Series A cumulative redeemable perpetual preferred stock    
Preferred Stock    
Preferred stock, dividend rate, percentage 7.375%  
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 2,000,000 0
Preferred stock, shares outstanding (in shares) 2,000,000 0
Preferred stock, shares issued (in shares) 2,000,000 0
Class C common stock    
Common Stock    
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares outstanding (in shares) 7,409,929 7,874,541
Common stock, shares issued (in shares) 7,409,929 7,874,541
Class S common stock    
Common Stock    
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares outstanding (in shares) 63,548 62,860
Common stock, shares issued (in shares) 63,548 62,860