Quarterly report pursuant to Section 13 or 15(d)

Debt - Components of Interest Expense, Related Fees, Losses on Debt Extinguishment and Cash Paid for Interest Expense for Debt (Details)

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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