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Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 11, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Registrant Name JASPER THERAPEUTICS, INC.  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001788028  
Entity File Number 001-39138  
Amendment Flag false  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-2984849  
Entity Address, Address Line One 2200 Bridge Pkwy  
Entity Address, Address Line Two Suite #102  
Entity Address, City or Town Redwood City  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94065  
City Area Code (650)  
Local Phone Number 549-1400  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   27,996,819
Voting Common Stock, par value $0.0001 per share    
Document Information [Line Items]    
Title of 12(b) Security Voting Common Stock, par value $0.0001 per share  
Trading Symbol JSPR  
Security Exchange Name NASDAQ  
Redeemable Warrants, each ten warrants exercisable for one share of Voting Common Stock at an exercise price of $115.00    
Document Information [Line Items]    
Title of 12(b) Security Redeemable Warrants, each ten warrants exercisable for one share of Voting Common Stock at an exercise price of $115.00  
Trading Symbol JSPRW  
Security Exchange Name NASDAQ