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Borrowings - Components of Interest Expense and Related Fees (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
2025 Notes    
Line Of Credit Facility [Line Items]    
Stated interest expense $ 3,194 $ 3,194
Amortization of deferred financing costs 498 504
Total interest and amortization of deferred financing costs $ 3,692 $ 3,698
Weighted average effective interest rate 8.10% 8.10%
Weighted average outstanding balance $ 182,500 $ 182,500
August 2026 Notes    
Line Of Credit Facility [Line Items]    
Stated interest expense 1,367 1,367
Amortization of deferred financing costs 144 144
Total interest and amortization of deferred financing costs $ 1,511 $ 1,511
Weighted average effective interest rate 4.80% 4.80%
Weighted average outstanding balance $ 125,000 $ 125,000
December 2026 Notes    
Line Of Credit Facility [Line Items]    
Stated interest expense 797 797
Amortization of deferred financing costs 99 93
Total interest and amortization of deferred financing costs $ 896 $ 890
Weighted average effective interest rate 4.80% 4.70%
Weighted average outstanding balance $ 75,000 $ 75,000
March 2029 Notes    
Line Of Credit Facility [Line Items]    
Stated interest expense 75  
Amortization of deferred financing costs 5  
Total interest and amortization of deferred financing costs $ 80  
Weighted average effective interest rate 8.50%  
Weighted average outstanding balance $ 3,791  
6.00% Convertible Notes due 2025    
Line Of Credit Facility [Line Items]    
Stated interest expense 750 750
Amortization of deferred financing costs $ 166 $ 160
Weighted average effective interest rate 7.30% 7.30%
Weighted average outstanding balance $ 50,000 $ 50,000
Total interest and amortization of deferred financing costs and original issue discount 916 910
KeyBank Credit Facility    
Line Of Credit Facility [Line Items]    
Stated interest expense 4,843 3,868
Amortization of deferred financing costs 206 204
Total interest and amortization of deferred financing costs $ 5,049 $ 4,072
Weighted average effective interest rate 9.10% 8.30%
Weighted average outstanding balance $ 221,086 $ 197,111