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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
ASSETS      
Investment in securities, amortized cost $ 17,279 $ 17,279 $ 42,279
Accounts receivable, net of allowance $ 179 $ 179 $ 459
Preferred stock, $0.01 par value, 80,000,000 shares authorized:      
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 80,000,000 80,000,000 80,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 250,000,000 250,000,000 250,000,000
Common stock, shares issued (in shares) 68,219,432 68,219,432 66,607,823
Common stock, shares outstanding (in shares) 68,219,432 68,219,432 66,607,823
Series B Preferred Stock      
Temporary Equity [Abstract]      
Temporary equity, dividend rate (as percent) 5.50% 5.50% 5.50%
Temporary equity, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Temporary equity, shares issued (in shares) 3,078,017 3,078,017 3,078,017
Temporary equity, shares outstanding (in shares) 3,078,017 3,078,017 3,078,017
Series E Preferred Stock      
Temporary Equity [Abstract]      
Temporary equity, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Temporary equity, shares issued (in shares) 12,697,673 12,697,673 14,910,521
Temporary equity, shares outstanding (in shares) 12,697,673 12,697,673 14,910,521
Series M Preferred Stock      
Temporary Equity [Abstract]      
Temporary equity, dividend rate (as percent)   8.20%  
Temporary equity, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Temporary equity, shares issued (in shares) 1,404,544 1,404,544 1,476,621
Temporary equity, shares outstanding (in shares) 1,404,544 1,404,544 1,476,621
Series D Preferred Stock      
Preferred stock, $0.01 par value, 80,000,000 shares authorized:      
Preferred stock dividend rate (as percent) 8.25% 8.25% 8.25%
Preferred stock, shares issued (in shares) 1,600,000 1,600,000 1,600,000
Preferred stock, shares outstanding (in shares) 1,600,000 1,600,000 1,600,000