Significant Concentrations (Details)	3 Months Ended		9 Months Ended
Significant Concentrations (Details)	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Concentration Risk [Line Items]
Percentage of fund from whole loan channel	0.96	0.94	0.96	0.94
Prosper Funding LLC
Concentration Risk [Line Items]
Percentage of fund from whole loan channel	0.96	0.94	0.96	0.94
Minimum
Concentration Risk [Line Items]
Transaction fee cap percentage (as a percent)			1.00%
Minimum \| Prosper Funding LLC
Concentration Risk [Line Items]
Transaction fee cap percentage (as a percent)			1.00%
Maximum
Concentration Risk [Line Items]
Transaction fee cap percentage (as a percent)			9.99%
Maximum \| Prosper Funding LLC
Concentration Risk [Line Items]
Transaction fee cap percentage (as a percent)			9.99%
Related Party One
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)	34.60%	17.40%	42.90%	15.40%
Related Party One \| Prosper Funding LLC
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)	34.60%	17.40%	42.90%	15.40%
Related Party Two
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)	21.80%	14.30%		13.90%
Related Party Two \| Prosper Funding LLC
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)	21.80%	14.30%	12.10%	13.90%
Related Party Three
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)	16.20%	13.20%		12.10%
Related Party Three \| Prosper Funding LLC
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)	16.20%	13.20%		12.10%
Related Party Four
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)		11.10%		12.00%
Related Party Four \| Prosper Funding LLC
Concentration Risk [Line Items]
Percentage of loan purchased (as a percent)		11.10%		12.00%