Long Term Debt - Schedule of Securitization Debt of Consolidated VIEs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 2,854
Net carrying value	$ 242,295
United Auto Credit 2021-1-D
Debt Instrument [Line Items]
Final Scheduled Payment Date		Jun. 10, 2026
Initial Principal		$ 29,380
Contractual Interest Rate		1.14%
Outstanding Principal		$ 3,246
Fair Value		$ 3,235
United Auto Credit 2021-1-E
Debt Instrument [Line Items]
Final Scheduled Payment Date		Jun. 10, 2026
Initial Principal		$ 20,800
Contractual Interest Rate		2.58%
Outstanding Principal		$ 20,800
Fair Value		$ 20,540
United Auto Credit 2021-1-F
Debt Instrument [Line Items]
Final Scheduled Payment Date		Sep. 10, 2027
Initial Principal		$ 13,910
Contractual Interest Rate		4.30%
Outstanding Principal		$ 13,910
Fair Value		$ 13,644
United Auto Credit 2022-2-B
Debt Instrument [Line Items]
Final Scheduled Payment Date		Dec. 10, 2025
Initial Principal		$ 30,324
Contractual Interest Rate		5.41%
Outstanding Principal		$ 28,786
Fair Value		$ 28,745
United Auto Credit 2022-2-C
Debt Instrument [Line Items]
Final Scheduled Payment Date	May 10, 2027	May 10, 2027
Initial Principal	$ 26,533	$ 26,533
Contractual Interest Rate	5.81%	5.81%
Outstanding Principal	$ 14,774	$ 26,533
Fair Value	$ 14,778	$ 26,331
United Auto Credit 2022-2-D
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jan. 10, 2028	Jan. 10, 2028
Initial Principal	$ 32,889	$ 32,889
Contractual Interest Rate	6.84%	6.84%
Outstanding Principal	$ 32,889	$ 32,889
Fair Value	$ 32,813	$ 32,642
United Auto Credit 2022-2-E
Debt Instrument [Line Items]
Final Scheduled Payment Date	Apr. 10, 2029	Apr. 10, 2029
Initial Principal	$ 33,440	$ 33,440
Contractual Interest Rate	10.00%	10.00%
Outstanding Principal	$ 28,440	$ 33,440
Fair Value	$ 16,925	$ 29,691
United Auto Credit 2023-1-A
Debt Instrument [Line Items]
Final Scheduled Payment Date		Jul. 10, 2025
Initial Principal		$ 118,598
Contractual Interest Rate		5.57%
Outstanding Principal		$ 15,089
Fair Value		$ 15,083
United Auto Credit 2023-1-B
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jul. 10, 2028	Jul. 10, 2028
Initial Principal	$ 51,157	$ 51,157
Contractual Interest Rate	5.91%	5.91%
Outstanding Principal	$ 9,604	$ 51,157
Fair Value	$ 9,604	$ 51,019
United Auto Credit 2023-1-C
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jul. 10, 2028	Jul. 10, 2028
Initial Principal	$ 33,326	$ 33,326
Contractual Interest Rate	6.28%	6.28%
Outstanding Principal	$ 33,326	$ 33,326
Fair Value	$ 33,346	$ 33,199
United Auto Credit 2023-1-D
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jul. 10, 2028	Jul. 10, 2028
Initial Principal	$ 35,653	$ 35,653
Contractual Interest Rate	8.00%	8.00%
Outstanding Principal	$ 35,653	$ 35,653
Fair Value	$ 36,366	$ 36,152
United Auto Credit 2023-1-E
Debt Instrument [Line Items]
Final Scheduled Payment Date	Sep. 10, 2029	Sep. 10, 2029
Initial Principal	$ 23,256	$ 23,256
Contractual Interest Rate	10.98%	10.98%
Outstanding Principal	$ 23,256	$ 23,256
Fair Value	$ 23,884	23,814
United Auto Credit 2024-1-A
Debt Instrument [Line Items]
Final Scheduled Payment Date	Aug. 10, 2026
Initial Principal	$ 132,340
Contractual Interest Rate	6.17%
Outstanding Principal	$ 77,489
United Auto Credit 2024-1-B
Debt Instrument [Line Items]
Final Scheduled Payment Date	Jun. 10, 2027
Initial Principal	$ 42,770
Contractual Interest Rate	6.57%
Outstanding Principal	$ 42,770
United Auto Credit 2024-1-C
Debt Instrument [Line Items]
Final Scheduled Payment Date	Oct. 10, 2029
Initial Principal	$ 35,190
Contractual Interest Rate	7.06%
Outstanding Principal	$ 35,190
United Auto Credit 2024-1-D
Debt Instrument [Line Items]
Final Scheduled Payment Date	Nov. 12, 2029
Initial Principal	$ 52,160
Contractual Interest Rate	8.30%
Outstanding Principal	$ 52,160
United Auto Credit 2024-1-E
Debt Instrument [Line Items]
Final Scheduled Payment Date	Nov. 12, 2030
Initial Principal	$ 37,540
Contractual Interest Rate	10.45%
Outstanding Principal	$ 37,540
Total Rated Notes
Debt Instrument [Line Items]
Initial Principal		449,266
Outstanding Principal		318,085
Fair Value		$ 314,095
Total Rated Notes At Fair Value
Debt Instrument [Line Items]
Initial Principal	236,254
Outstanding Principal	177,942
Fair Value	167,716
Total Rated Notes At Amortized Cost
Debt Instrument [Line Items]
Initial Principal	300,000
Outstanding Principal	$ 245,149

Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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Debt instrument initial principal amount.

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