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Borrowings - Components of Interest Expense and Related Fees (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
2025 Notes    
Line Of Credit Facility [Line Items]    
Stated interest expense $ 3,194 $ 2,188
Amortization of deferred financing costs 504 298
Total interest and amortization of deferred financing costs $ 3,698 $ 2,486
Weighted average effective interest rate 8.10% 8.00%
Weighted average outstanding balance $ 182,500 $ 125,000
August 2026 Notes    
Line Of Credit Facility [Line Items]    
Stated interest expense 1,367 1,352
Amortization of deferred financing costs 144 144
Total interest and amortization of deferred financing costs $ 1,511 $ 1,496
Weighted average effective interest rate 4.80% 4.80%
December 2026 Notes    
Line Of Credit Facility [Line Items]    
Stated interest expense $ 797 $ 797
Amortization of deferred financing costs 93 93
Total interest and amortization of deferred financing costs $ 890 $ 890
Weighted average effective interest rate 4.70%  
Weighted average effective interest rate   4.70%
6.00% Convertible Notes due 2025    
Line Of Credit Facility [Line Items]    
Stated interest expense $ 750 $ 750
Amortization of deferred financing costs $ 160 $ 160
Weighted average effective interest rate 7.30% 7.30%
Total interest and amortization of deferred financing costs and original issue discount $ 910 $ 910
KeyBank Credit Facility    
Line Of Credit Facility [Line Items]    
Stated interest expense 3,868 851
Amortization of deferred financing costs 204 120
Total interest and amortization of deferred financing costs $ 4,072 $ 971
Weighted average effective interest rate 8.30% 4.70%
Weighted average outstanding balance $ 197,111 $ 81,900