Continuing Involvement With Transferred Financial Assets Original Term Four

No definition available.

Name:	prosper_ContinuingInvolvementWithTransferredFinancialAssetsOriginalTermFour
Namespace Prefix:	prosper_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Continuing Involvement With Transferred Financial Assets Original Term, One

+ References

No definition available.

+ Details

Name:	prosper_ContinuingInvolvementWithTransferredFinancialAssetsOriginalTermOne
Namespace Prefix:	prosper_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Continuing Involvement With Transferred Financial Assets Original Term, Term Two

+ References

No definition available.

+ Details

Name:	prosper_ContinuingInvolvementWithTransferredFinancialAssetsOriginalTermTermTwo
Namespace Prefix:	prosper_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Continuing Involvement With Transferred Financial Assets Original Term Three

+ References

No definition available.

+ Details

Name:	prosper_ContinuingInvolvementWithTransferredFinancialAssetsOriginalTermThree
Namespace Prefix:	prosper_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate maximum.

+ References

No definition available.

+ Details

Name:	prosper_FixedInterestRateMaximum
Namespace Prefix:	prosper_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate minimum.

+ References

No definition available.

+ Details

Name:	prosper_FixedInterestRateMinimum
Namespace Prefix:	prosper_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

Name:	us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-2

+ Details

Name:	us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(h))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_GainLossOnSalesOfLoansNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of total assets less all liabilities and indebtedness not represented by senior security, to senior security representing indebtedness.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Investment Company Act of 1940
-Section 61
-Paragraph a
-Subparagraph (1)
-Publisher SEC

+ Details

Name:	us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RisksInherentInServicingAssetsAndServicingLiabilitiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481260/860-50-45-2

+ Details

Name:	us-gaap_ServicingAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=prosper_ProsperFundingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=prosper_ServicingAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SERVICING ASSET (Details) - USD ($) $ in Thousands	12 Months Ended
SERVICING ASSET (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2025
Servicing Assets And Liabilities Fair Value [Line Items]
Gain (loss) on sales of loans, net	$ (55,212)	$ (45,316)	$ (12,380)
Servicing asset				$ 1,500
Maximum
Servicing Assets And Liabilities Fair Value [Line Items]
Asset coverage ratio				0.633%
Minimum
Servicing Assets And Liabilities Fair Value [Line Items]
Asset coverage ratio				0.593%
Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Gain (loss) on sales of loans, net	(55,212)	(45,316)	(11,285)
Servicing asset	$ 1,500
Prosper Funding LLC \| Maximum
Servicing Assets And Liabilities Fair Value [Line Items]
Asset coverage ratio	0.633%
Prosper Funding LLC \| Minimum
Servicing Assets And Liabilities Fair Value [Line Items]
Asset coverage ratio	0.593%
Servicing Assets
Servicing Assets And Liabilities Fair Value [Line Items]
Gain (loss) on sales of loans, net	$ 13,600	11,000	9,200
Outstanding principal	$ 3,800,000	$ 3,300,000
Maturity term one, in months	24 months	24 months
Maturity term two, in months	36 months	36 months
Maturity term three, in months	48 months	48 months
Maturity term four, in months	60 months	60 months
Fixed interest rate, minimum	5.75%	5.46%
Fixed interest rate, maximum	33.00%	33.00%
Contractually specified servicing fees, late charges and ancillary fees	$ 40,800	$ 32,000	30,900
Servicing Assets \| Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Gain (loss) on sales of loans, net	13,600	11,000	9,200
Outstanding principal	$ 3,800,000	$ 3,500,000
Fixed interest rate, minimum	5.75%	5.46%
Fixed interest rate, maximum	33.00%	33.00%
Contractually specified servicing fees, late charges and ancillary fees	$ 47,700	$ 39,600	$ 39,700
Servicing Assets \| Prosper Funding LLC \| Maximum
Servicing Assets And Liabilities Fair Value [Line Items]
Maturity term four, in months	60 months	60 months
Servicing Assets \| Prosper Funding LLC \| Minimum
Servicing Assets And Liabilities Fair Value [Line Items]
Maturity term one, in months	24 months	24 months
Maturity term two, in months	36 months	36 months
Maturity term three, in months	48 months	48 months