Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Interest expense $ 54,749 [1] $ 54,447 [2] $ 59,605 [3]
Amortization of debt issuance costs 4,800 10,451 [4] 5,005
Total interest expense and fees 62,347 67,523 66,874
Cash paid for interest expense 52,075 51,469 58,274
Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 2,798 2,625 2,264
SBA Debentures      
Debt Instrument [Line Items]      
Interest expense 3,997 [1] 1,580 [2] 3,464 [3]
Amortization of debt issuance costs 581 452 [4] 551
Total interest expense and fees 4,578 2,032 4,015
Cash paid for interest expense 2,835 2,272 4,285
SBA Debentures | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0 0
2022 Notes      
Debt Instrument [Line Items]      
Interest expense 1,011 [1],[5] 7,102 [2] 7,307 [3]
Amortization of debt issuance costs 50 [5] 360 [4] 360
Total interest expense and fees 1,061 [5] 7,462 7,667
Cash paid for interest expense 2,293 [5] 6,938 6,938
2022 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 [5] 0 0
July 2024 Notes      
Debt Instrument [Line Items]      
Interest expense 5,009 [1] 5,009 [2] 5,009 [3]
Amortization of debt issuance costs 295 295 [4] 294
Total interest expense and fees 5,304 5,304 5,303
Cash paid for interest expense 5,009 5,008 5,009
July 2024 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0 0
February 2025 Notes      
Debt Instrument [Line Items]      
Interest expense 2,140 [1] 2,140 [2] 1,938 [3]
Amortization of debt issuance costs 115 115 [4] 103
Total interest expense and fees 2,255 2,255 2,041
Cash paid for interest expense 2,140 2,140 1,070
February 2025 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0 0
June 2025 Notes      
Debt Instrument [Line Items]      
Interest expense 3,017 [1] 3,017 [2] 1,743 [3]
Amortization of debt issuance costs 162 162 [4] 92
Total interest expense and fees 3,179 3,179 1,835
Cash paid for interest expense 3,017 3,017 1,509
June 2025 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0 0
June 2025 3-Year Notes      
Debt Instrument [Line Items]      
Interest expense [1] 1,567    
Amortization of debt issuance costs 81    
Total interest expense and fees 1,648    
Cash paid for interest expense 1,500    
June 2025 3-Year Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0    
March 2026 A Notes      
Debt Instrument [Line Items]      
Interest expense 2,250 [1] 2,250 [2] 356 [3]
Amortization of debt issuance costs 95 93 [4] 14
Total interest expense and fees 2,345 2,343 370
Cash paid for interest expense 2,250 1,875 0
March 2026 A Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0 0
March 2026 B Notes      
Debt Instrument [Line Items]      
Interest expense 2,275 [1] 1,877 [2]  
Amortization of debt issuance costs 103 85 [4]  
Total interest expense and fees 2,378 1,962  
Cash paid for interest expense 2,275 1,138  
March 2026 B Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0  
September 2026 Notes      
Debt Instrument [Line Items]      
Interest expense 8,698 [1] 2,513 [2]  
Amortization of debt issuance costs 815 236 [4]  
Total interest expense and fees 9,513 2,749  
Cash paid for interest expense 8,531 0  
September 2026 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0  
January 2027 Notes      
Debt Instrument [Line Items]      
Interest expense [1] 11,630    
Amortization of debt issuance costs 782    
Total interest expense and fees 12,412    
Cash paid for interest expense 5,906    
January 2027 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0    
2031 Asset-Backed Notes      
Debt Instrument [Line Items]      
Interest expense [1] 3,975    
Amortization of debt issuance costs 209    
Total interest expense and fees 4,184    
Cash paid for interest expense 3,671    
2031 Asset-Backed Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0    
2033 Notes      
Debt Instrument [Line Items]      
Interest expense 2,500 [1] 2,500 [2] 2,500 [3]
Amortization of debt issuance costs 108 108 [4] 108
Total interest expense and fees 2,608 2,608 2,608
Cash paid for interest expense 2,500 2,500 2,500
2033 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 0 0
2022 Convertible Notes      
Debt Instrument [Line Items]      
Interest expense 923 [1],[5] 10,734 [2] 10,733 [3]
Amortization of debt issuance costs 148 [5] 892 [4] 892
Total interest expense and fees 1,071 [5] 11,626 11,625
Cash paid for interest expense 5,004 [5] 10,062 10,062
2022 Convertible Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 0 [5] 0 0
MUFG Bank Facility      
Debt Instrument [Line Items]      
Interest expense 4,548 [1],[6] 672 [2],[7]  
Amortization of debt issuance costs 941 [6] 1,228 [4],[7]  
Total interest expense and fees 7,774 [6] 3,806 [7]  
Cash paid for interest expense 4,097 [6] 672 [7]  
MUFG Bank Facility | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) 2,285 [6] 1,906 [7]  
SMBC Facility      
Debt Instrument [Line Items]      
Interest expense 1,209 [1] 57 [2]  
Amortization of debt issuance costs 315 33 [4]  
Total interest expense and fees 2,037 134  
Cash paid for interest expense 1,047 0  
SMBC Facility | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) $ 513 44  
April 2025 Notes      
Debt Instrument [Line Items]      
Interest expense   1,969 [2],[8] 3,938 [3]
Amortization of debt issuance costs   1,667 [4],[8] 381
Total interest expense and fees   3,636 [8] 4,319
Cash paid for interest expense   2,635 [8] 3,938
April 2025 Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees)   0 [8] 0
2027 Asset-Backed Notes      
Debt Instrument [Line Items]      
Interest expense   4,888 [2],[8] 9,116 [3]
Amortization of debt issuance costs   2,176 [4],[8] 512
Total interest expense and fees   7,064 [8] 9,628
Cash paid for interest expense   4,972 [8] 9,139
2027 Asset-Backed Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees)   0 [7] 0
2028 Asset-Backed Notes      
Debt Instrument [Line Items]      
Interest expense   8,139 [2],[8] 11,758 [3]
Amortization of debt issuance costs   2,351 [4],[8] 257
Total interest expense and fees   10,490 [8] 12,015
Cash paid for interest expense   8,240 [8] 11,756
2028 Asset-Backed Notes | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees)   0 [8] 0
Wells Facility      
Debt Instrument [Line Items]      
Interest expense   0 [2],[8] 25 [3]
Amortization of debt issuance costs   198 [4],[8] 175
Total interest expense and fees   873 [8] 719
Cash paid for interest expense   0 [8] 26
Wells Facility | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees)   $ 675 [8] 519
Union Bank Facility      
Debt Instrument [Line Items]      
Interest expense [3],[9]     1,718
Amortization of debt issuance costs [9]     1,266
Total interest expense and fees [9]     4,729
Cash paid for interest expense [9]     2,042
Union Bank Facility | Unused Facility Other Fees [Member]      
Debt Instrument [Line Items]      
Unused facility and other fees (loan fees) [9]     $ 1,745
[1] Interest expense includes amortization of original issue discounts for the year ended December 31, 2022, of $23 thousand, $112 thousand, $166 thousand, $475 thousand, and $98 thousand related to the 2022 Notes, 2022 Convertible Notes, September 2026 Notes, January 2027 Notes, and 2031 Asset-Backed Notes, respectively.
[2] Interest expense includes amortization of original issue discounts for the year ended December 31, 2021, of $165 thousand, $671 thousand, and $48 thousand for the 2022 Notes, 2022 Convertible Notes, and September 2026 Notes, respectively.
[3] Interest expense includes amortization of original issue discounts for the year ended December 31, 2020, of $165 thousand, $671 thousand, for the 2022 Notes, and 2022 Convertible Notes, respectively.
[4] “Amortization of debt issuance cost (loan fees)” includes $1,477 thousand, $1,272 thousand, and $1,670 thousand related to debt extinguishment costs for the April 2025 Notes, 2027 Asset-Backed Notes, and 2028 Asset-Backed Notes, respectively for the year ended December 31, 2021 disclosed as a “Loss on debt extinguishment” in the Consolidated Statement of Operations.
[5] The Company fully redeemed the 2022 Notes on February 22, 2022 and fully repaid the 2022 Convertible Notes on February 1, 2022.
[6] The June 2022 amendment of the MUFG Bank Facility replaced the Union Bank Facility via an amendment which changed the lead lender.
[7] The June 2022 amendment of the MUFG Bank Facility replaced Union Bank Facility via an amendment as the lead lender.
[8] The April 2025 Notes, 2027 Asset-Backed Notes and 2028 Asset-Backed Notes were retired on July 1, 2021 and October 20, 2021, respectively. The Wells Facility was terminated on November 29, 2021.
[9] The June 2022 amendment of the MUFG Bank Facility replaced Union Bank Facility via an amendment as the lead lender.