RELATED PARTIES - Additional Information (Details)	12 Months Ended
Dec. 31, 2025
Related Party Transactions [Abstract]
Minimum percentage of voting securities considered for related parties (more than)	10.00%
Minimum percentage of stock holders considered for related parties	10.00%

Minimum percentage of voting securities holders engaged in various transactions as related party.

No definition available.

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