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Debt - Components of Interest Expense, Related Fees and Cash Paid for Interest Expense for Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Debt Instrument [Line Items] |  |  |
Interest expense | $ 19,698 | $ 17,624 |
Amortization of debt issuance cost (loan fees) | 1,619 | 1,542 |
Unused facility and other fees (loan fees) | 779 | 855 |
Total interest expense and fees | 22,096 | 20,021 |
Cash paid for interest expense | 25,580 | 24,084 |
Loss on extinguishment of debt | 15 | 0 |
SBA Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,499 | 1,137 |
Amortization of debt issuance cost (loan fees) | 227 | 146 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 2,726 | 1,283 |
Cash paid for interest expense | 3,971 | 2,275 |
July 2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense |  | 1,252 |
Amortization of debt issuance cost (loan fees) |  | 74 |
Unused facility and other fees (loan fees) |  | 0 |
Total interest expense and fees |  | 1,326 |
Cash paid for interest expense |  | 2,504 |
February 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 202 | 535 |
Amortization of debt issuance cost (loan fees) | 19 | 29 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 221 | 564 |
Cash paid for interest expense | 1,070 | 1,070 |
June 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 754 | 754 |
Amortization of debt issuance cost (loan fees) | 40 | 40 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 794 | 794 |
Cash paid for interest expense | 0 | 0 |
June 2025 3-Year Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 750 | 750 |
Amortization of debt issuance cost (loan fees) | 39 | 39 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 789 | 789 |
Cash paid for interest expense | 0 | 0 |
March 2026 A Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 562 | 563 |
Amortization of debt issuance cost (loan fees) | 24 | 24 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 586 | 587 |
Cash paid for interest expense | 1,125 | 1,125 |
March 2026 B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 568 | 569 |
Amortization of debt issuance cost (loan fees) | 26 | 26 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 594 | 595 |
Cash paid for interest expense | 1,138 | 1,138 |
September 2026 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,175 | 2,175 |
Amortization of debt issuance cost (loan fees) | 203 | 203 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 2,378 | 2,378 |
Cash paid for interest expense | 4,266 | 4,265 |
Amortization of original issue discounts | 42 | 42 |
January 2027 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 3,079 | 3,079 |
Amortization of debt issuance cost (loan fees) | 207 | 207 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 3,286 | 3,286 |
Cash paid for interest expense | 5,906 | 5,906 |
Amortization of original issue discounts | 126 | 126 |
2028 Convertible Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 827 |  |
Amortization of debt issuance cost (loan fees) | 77 |  |
Unused facility and other fees (loan fees) | 0 |  |
Total interest expense and fees | 904 |  |
Cash paid for interest expense | 0 |  |
Amortization of original issue discounts | 68 |  |
2031 Asset-Backed Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 1,492 | 1,903 |
Amortization of debt issuance cost (loan fees) | 80 | 100 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 1,572 | 2,003 |
Cash paid for interest expense | 1,457 | 1,856 |
Amortization of original issue discounts | 38 | 47 |
Loss on extinguishment of debt | 15 |  | $ 200
2033 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 625 | 625 |
Amortization of debt issuance cost (loan fees) | 27 | 27 |
Unused facility and other fees (loan fees) | 0 | 0 |
Total interest expense and fees | 652 | 652 |
Cash paid for interest expense | 625 | 625 |
MUFG Bank Facility |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 2,570 | 1,933 |
Amortization of debt issuance cost (loan fees) | 442 | 447 |
Unused facility and other fees (loan fees) | 560 | 609 |
Total interest expense and fees | 3,572 | 2,989 |
Cash paid for interest expense | 2,179 | 1,566 |
SMBC Facility |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 3,595 | 2,349 |
Amortization of debt issuance cost (loan fees) | 208 | 180 |
Unused facility and other fees (loan fees) | 219 | 246 |
Total interest expense and fees | 4,022 | 2,775 |
Cash paid for interest expense | $ 3,843 | $ 1,754 |

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