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Debt - Schedule of Debt Issuance Costs, Net of accumulated Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | $ 23,700 | $ 16,035
SBA Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 5,409 | 5,002
2022 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 0 | 300
July 2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 541 | 762
February 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 277 | 363
June 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 445 | 567
June 2025 3-Year Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 423 | 0
March 2026 A Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 324 | 395
March 2026 B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 353 | 430
September 2026 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 3,888 | 4,624
January 2027 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 5,729 | 0
2031 Asset-Backed Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 2,190 | 0
2033 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 1,201 | 1,282
2022 Convertible Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 0 | 149
MUFG Bank Facility |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs | [1] | 1,346 | 1,239
SMBC Facility |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs | [1] | $ 1,574 | $ 922
[1] | The MUFG Bank Facility (f.k.a. Union Bank Facility) and SMBC Facility, are line-of-credit arrangements, the debt issuance costs associated with these instruments are included within Other assets on the Consolidated Statements of Assets and Liabilities in accordance with ASC Subtopic 835-30.

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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