EMPLOYEE BENEFIT PLANS (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Retirement Benefits [Abstract]
Deferred compensation arrangement with eligible employees, percentage (up to)	90.00%
Employer contribution during the period	$ 0	$ 0

Represents percentage of eligible compensation that could be deferred by an eligible employee.

No definition available.

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