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Debt - Components of Interest Expense, Related Fees, Losses on Debt Extinguishment and Cash Paid for Interest Expense for Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Instrument [Line Items] |  |  |  |
Interest expense | $ 16,428 | $ 14,499 | $ 50,237 | $ 38,844
Amortization of debt issuance cost (loan fees) | 1,539 | 1,268 | 4,585 | 3,507
Unused facility and other fees (loan fees) | 985 | 915 | 2,732 | 2,010
Total interest expense and fees | 18,952 | 16,682 | 57,554 | 44,361
Cash paid for interest expense | 23,747 | 21,740 | 57,410 | 44,382
SBA Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,150 | 1,160 | 3,412 | 2,848
Amortization of debt issuance cost (loan fees) | 146 | 148 | 436 | 434
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 1,296 | 1,308 | 3,848 | 3,282
Cash paid for interest expense | 2,300 | 2,086 | 4,562 | 2,835
2022 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense |  | 0 |  | 1,011
Amortization of debt issuance cost (loan fees) |  | 0 |  | 50
Unused facility and other fees (loan fees) |  | 0 |  | 0
Total interest expense and fees |  | 0 |  | 1,061
Cash paid for interest expense |  | 0 |  | 2,293
Amortization of original issue discounts |  |  |  | 23
July 2024 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,252 | 1,252 | 3,756 | 3,756
Amortization of debt issuance cost (loan fees) | 74 | 74 | 222 | 222
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 1,326 | 1,326 | 3,978 | 3,978
Cash paid for interest expense | 2,505 | 2,504 | 5,009 | 5,008
February 2025 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 535 | 535 | 1,605 | 1,605
Amortization of debt issuance cost (loan fees) | 29 | 29 | 86 | 86
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 564 | 564 | 1,691 | 1,691
Cash paid for interest expense | 1,070 | 1,070 | 2,140 | 2,140
June 2025 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 754 | 754 | 2,263 | 2,263
Amortization of debt issuance cost (loan fees) | 40 | 40 | 121 | 121
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 794 | 794 | 2,384 | 2,384
Cash paid for interest expense | 0 | 0 | 1,509 | 1,509
June 2025 3-Year Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 750 | 750 | 2,250 | 817
Amortization of debt issuance cost (loan fees) | 39 | 38 | 117 | 42
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 789 | 788 | 2,367 | 859
Cash paid for interest expense | 0 | 0 | 1,500 | 0
March 2026 A Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 563 | 563 | 1,688 | 1,688
Amortization of debt issuance cost (loan fees) | 24 | 24 | 71 | 72
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 587 | 587 | 1,759 | 1,760
Cash paid for interest expense | 1,125 | 1,125 | 2,250 | 2,250
March 2026 B Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 569 | 569 | 1,706 | 1,706
Amortization of debt issuance cost (loan fees) | 26 | 26 | 78 | 78
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 595 | 595 | 1,784 | 1,784
Cash paid for interest expense | 1,138 | 1,137 | 2,275 | 2,275
September 2026 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 2,174 | 2,174 | 6,523 | 6,523
Amortization of debt issuance cost (loan fees) | 203 | 204 | 611 | 612
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 2,377 | 2,378 | 7,134 | 7,135
Cash paid for interest expense | 4,266 | 4,266 | 8,532 | 8,532
Amortization of original issue discounts | 42 | 42 | 125 | 125
January 2027 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 3,079 | 3,079 | 9,236 | 8,552
Amortization of debt issuance cost (loan fees) | 207 | 207 | 621 | 575
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 3,286 | 3,286 | 9,857 | 9,127
Cash paid for interest expense | 5,906 | 5,906 | 11,812 | 5,906
Amortization of original issue discounts | 126 | 126 | 377 | 349
2031 Asset-Backed Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,902 | 1,903 | 5,709 | 2,072
Amortization of debt issuance cost (loan fees) | 101 | 100 | 301 | 109
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 2,003 | 2,003 | 6,010 | 2,181
Cash paid for interest expense | 1,857 | 1,815 | 5,570 | 1,815
Amortization of original issue discounts | 47 | 47 | 141 | 51
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
2022 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense |  | 0 |  | 923
Amortization of debt issuance cost (loan fees) |  | 0 |  | 149
Unused facility and other fees (loan fees) |  | 0 |  | 0
Total interest expense and fees |  | 0 |  | 1,072
Cash paid for interest expense |  | 0 |  | 5,004
Amortization of original issue discounts |  |  |  | 112
MUFG Bank Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,247 | 1,000 | 4,323 | 2,483
Amortization of debt issuance cost (loan fees) | 443 | 253 | 1,327 | 665
Unused facility and other fees (loan fees) | 709 | 720 | 2,017 | 1,682
Total interest expense and fees | 2,399 | 1,973 | 7,667 | 4,830
Cash paid for interest expense | 1,240 | 1,025 | 4,673 | 2,240
SMBC Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,828 | 135 | 5,891 | 722
Amortization of debt issuance cost (loan fees) | 180 | 98 | 513 | 211
Unused facility and other fees (loan fees) | 276 | 195 | 715 | 328
Total interest expense and fees | 2,284 | 428 | 7,119 | 1,261
Cash paid for interest expense | $ 1,715 | $ 181 | $ 5,703 | $ 700

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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://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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-1A Reference 4: 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 + Details
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