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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Instrument [Line Items] |  |  |  |
Interest expense | $ 24,189 | $ 20,370 | $ 66,817 | $ 57,156
Amortization of debt issuance cost (loan fees) | 1,887 | 1,490 | 5,385 | 4,565
Unused facility and other fees (loan fees) | 1,117 | 503 | 2,764 | 2,171
Total interest expense and fees | 27,193 | 22,363 | 74,966 | 63,892
Cash paid for interest expense | 29,787 | 28,685 | 66,795 | 64,221
SBA Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 3,381 | 1,149 | 8,806 | 3,424
Amortization of debt issuance cost (loan fees) | 295 | 147 | 785 | 439
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 3,676 | 1,296 | 9,591 | 3,863
Cash paid for interest expense | 5,892 | 2,300 | 9,863 | 4,575
July 2024 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense |  | 202 |  | 2,706
Amortization of debt issuance cost (loan fees) |  | 24 |  | 172
Unused facility and other fees (loan fees) |  | 0 |  | 0
Total interest expense and fees |  | 226 |  | 2,878
Cash paid for interest expense |  | 2,504 |  | 5,008
February 2025 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 0 | 535 | 202 | 1,605
Amortization of debt issuance cost (loan fees) | 0 | 29 | 19 | 86
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 0 | 564 | 221 | 1,691
Cash paid for interest expense | 0 | 1,070 | 1,070 | 2,140
June 2025 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 0 | 755 | 1,274 | 2,263
Amortization of debt issuance cost (loan fees) | 0 | 40 | 81 | 121
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 0 | 795 | 1,355 | 2,384
Cash paid for interest expense | 0 | 0 | 1,508 | 1,508
June 2025 3-Year Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 0 | 750 | 1,433 | 2,250
Amortization of debt issuance cost (loan fees) | 0 | 38 | 74 | 116
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 0 | 788 | 1,507 | 2,366
Cash paid for interest expense | 0 | 0 | 1,500 | 1,500
March 2026 A Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 562 | 563 | 1,687 | 1,688
Amortization of debt issuance cost (loan fees) | 23 | 24 | 71 | 71
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 585 | 587 | 1,758 | 1,759
Cash paid for interest expense | 1,125 | 1,125 | 2,250 | 2,250
March 2026 B Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 569 | 568 | 1,706 | 1,706
Amortization of debt issuance cost (loan fees) | 25 | 25 | 77 | 77
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 594 | 593 | 1,783 | 1,783
Cash paid for interest expense | 1,138 | 1,138 | 2,276 | 2,276
September 2026 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 2,174 | 2,174 | 6,523 | 6,523
Amortization of debt issuance cost (loan fees) | 204 | 205 | 611 | 612
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 2,378 | 2,379 | 7,134 | 7,135
Cash paid for interest expense | 4,266 | 4,266 | 8,532 | 8,531
Amortization of original issue discounts | 42 | 42 | 125 | 125
January 2027 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 3,079 | 3,080 | 9,236 | 9,236
Amortization of debt issuance cost (loan fees) | 208 | 208 | 621 | 622
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 3,287 | 3,288 | 9,857 | 9,858
Cash paid for interest expense | 5,906 | 5,906 | 11,812 | 11,812
Amortization of original issue discounts | 126 | 126 | 377 | 377
2028 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 3,763 |  | 8,315 |
Amortization of debt issuance cost (loan fees) | 353 |  | 781 |
Unused facility and other fees (loan fees) | 0 |  | 0 |
Total interest expense and fees | 4,116 |  | 9,096 |
Cash paid for interest expense | 6,487 |  | 6,487 |
Amortization of original issue discounts | 311 |  | 690 |
June 2030 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 5,441 |  | 6,348 |
Amortization of debt issuance cost (loan fees) | 221 |  | 258 |
Unused facility and other fees (loan fees) | 0 |  | 0 |
Total interest expense and fees | 5,662 |  | 6,606 |
Cash paid for interest expense | 0 |  | 0 |
Amortization of original issue discounts | 191 |  | 223 |
2031 Asset-Backed Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,243 | 1,903 | 4,206 | 5,710
Amortization of debt issuance cost (loan fees) | 69 | 100 | 229 | 300
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 1,312 | 2,003 | 4,435 | 6,010
Cash paid for interest expense | 1,241 | 1,856 | 4,139 | 5,568
Amortization of original issue discounts | 34 | 47 | 109 | 141
2033 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 625 | 625 | 1,875 | 1,875
Amortization of debt issuance cost (loan fees) | 27 | 27 | 81 | 81
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 652 | 652 | 1,956 | 1,956
Cash paid for interest expense | 625 | 625 | 1,875 | 1,875
MUFG Bank Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,191 | 4,105 | 5,736 | 8,181
Amortization of debt issuance cost (loan fees) | 259 | 443 | 1,083 | 1,328
Unused facility and other fees (loan fees) | 798 | 329 | 1,997 | 1,572
Total interest expense and fees | 2,248 | 4,877 | 8,816 | 11,081
Cash paid for interest expense | 1,210 | 3,875 | 5,719 | 7,596
SMBC Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 2,161 | 3,961 | 9,470 | 9,989
Amortization of debt issuance cost (loan fees) | 203 | 180 | 614 | 540
Unused facility and other fees (loan fees) | 319 | 174 | 767 | 599
Total interest expense and fees | 2,683 | 4,315 | 10,851 | 11,128
Cash paid for interest expense | $ 1,897 | $ 4,020 | $ 9,764 | $ 9,582

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-3 + Details
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