v3.26.1
Cover Page - shares
 6 Months Ended
Jun. 30, 2026
Aug. 11, 2026
Entity Information [Line Items]    
Document Type 10-Q  
Document Period End Date Jun. 30, 2026  
Entity File Number 333-280336  
Entity Registrant Name PROSPER MARKETPLACE, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 73-1733867  
Entity Address, Address Line One 221 Main Street  
Entity Address, Address Line Two 3rd Floor  
Entity Address, City or Town San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94105  
City Area Code 415  
Local Phone Number 593-5426  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   79,935,949
Document Quarterly Report true  
Document Transition Report false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001416265  
Prosper Funding LLC    
Entity Information [Line Items]    
Entity File Number 333-280336-01  
Entity Registrant Name PROSPER FUNDING LLC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 45-4526070  
Entity Address, Address Line One 221 Main Street  
Entity Address, Address Line Two 3rd Floor  
Entity Address, City or Town San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94105  
City Area Code 415  
Local Phone Number 593-5426  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   0
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001542574