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Debt - Schedule of Components of Interest Expense, Related Fees, Losses on Debt Extinguishment and Cash Paid for Interest Expense for Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |
Interest expense | $ 77,151 | $ 67,620 | $ 54,749
Amortization of debt issuance cost (loan fees) | 6,073 | 6,123 | 4,800
Unused facility and other fees (loan fees) | 2,734 | 3,722 | 2,798
Total interest expense and fees | 85,958 | 77,465 | 62,347
Cash paid for interest expense | 77,850 | 67,149 | 52,075
Loss on extinguishment of debt | 171 | 0 | 3,686
SBA Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 4,993 | 4,562 | 3,997
Amortization of debt issuance cost (loan fees) | 621 | 585 | 581
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 5,614 | 5,147 | 4,578
Cash paid for interest expense | 4,575 | 4,562 | 2,835
2022 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense |  |  | 1,011
Amortization of debt issuance cost (loan fees) |  |  | 50
Unused facility and other fees (loan fees) |  |  | 0
Total interest expense and fees |  |  | 1,061
Cash paid for interest expense |  |  | 2,293
Amortization of original issue discounts |  |  | 23
July 2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,706 | 5,009 | 5,009
Amortization of debt issuance cost (loan fees) | 172 | 295 | 295
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 2,878 | 5,304 | 5,304
Cash paid for interest expense | 5,008 | 5,009 | 5,009
February 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,140 | 2,140 | 2,140
Amortization of debt issuance cost (loan fees) | 115 | 115 | 115
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 2,255 | 2,255 | 2,255
Cash paid for interest expense | 2,140 | 2,140 | 2,140
June 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 3,017 | 3,017 | 3,017
Amortization of debt issuance cost (loan fees) | 162 | 162 | 162
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 3,179 | 3,179 | 3,179
Cash paid for interest expense | 3,016 | 3,017 | 3,017
June 2025 3-Year Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 3,000 | 3,000 | 1,567
Amortization of debt issuance cost (loan fees) | 155 | 155 | 81
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 3,155 | 3,155 | 1,648
Cash paid for interest expense | 3,000 | 3,000 | 1,500
March 2026 A Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,250 | 2,250 | 2,250
Amortization of debt issuance cost (loan fees) | 95 | 95 | 95
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 2,345 | 2,345 | 2,345
Cash paid for interest expense | 2,250 | 2,250 | 2,250
March 2026 B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,275 | 2,275 | 2,275
Amortization of debt issuance cost (loan fees) | 103 | 103 | 103
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 2,378 | 2,378 | 2,378
Cash paid for interest expense | 2,276 | 2,276 | 2,275
September 2026 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 8,697 | 8,697 | 8,698
Amortization of debt issuance cost (loan fees) | 815 | 815 | 815
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 9,512 | 9,512 | 9,513
Cash paid for interest expense | 8,531 | 8,532 | 8,531
Amortization of original issue discounts | 166 | 166 | 166
January 2027 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 12,316 | 12,316 | 11,630
Amortization of debt issuance cost (loan fees) | 828 | 828 | 782
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 13,144 | 13,144 | 12,412
Cash paid for interest expense | 11,812 | 11,812 | 5,906
Amortization of original issue discounts | 503 | 503 | 475
2031 Asset-Backed Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 7,464 | 7,613 | 3,975
Amortization of debt issuance cost (loan fees) | 394 | 399 | 209
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 7,858 | 8,012 | 4,184
Cash paid for interest expense | 7,321 | 7,425 | 3,671
Amortization of original issue discounts | 185 | 188 | 98
Loss on extinguishment of debt | 171 |  |
2033 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,500 | 2,500 | 2,500
Amortization of debt issuance cost (loan fees) | 108 | 108 | 108
Unused facility and other fees (loan fees) | 0 | 0 | 0
Total interest expense and fees | 2,608 | 2,608 | 2,608
Cash paid for interest expense | 2,500 | 2,500 | 2,500
2022 Convertible Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense |  |  | 923
Amortization of debt issuance cost (loan fees) |  |  | 148
Unused facility and other fees (loan fees) |  |  | 0
Total interest expense and fees |  |  | 1,071
Cash paid for interest expense |  |  | 5,004
Amortization of original issue discounts |  |  | 112
MUFG Bank Facility |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 11,931 | 5,583 | 4,548
Amortization of debt issuance cost (loan fees) | 1,770 | 1,770 | 941
Unused facility and other fees (loan fees) | 1,949 | 2,782 | 2,285
Total interest expense and fees | 15,650 | 10,135 | 7,774
Cash paid for interest expense | 11,866 | 5,948 | 4,097
SMBC Facility |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 13,862 | 8,658 | 1,209
Amortization of debt issuance cost (loan fees) | 735 | 693 | 315
Unused facility and other fees (loan fees) | 785 | 940 | 513
Total interest expense and fees | 15,382 | 10,291 | 2,037
Cash paid for interest expense | $ 13,555 | $ 8,678 | $ 1,047

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