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Cover Page - shares
 6 Months Ended
Jun. 30, 2026
Jul. 17, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Entity File Number 001-36771  
Entity Registrant Name Happen, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 51-0605731  
Entity Address, Address Line One 88 Kearny Street,  
Entity Address, Address Line Two Suite 600,  
Entity Address, City or Town San Francisco,  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94108  
City Area Code 415  
Local Phone Number 930-7440  
Title of 12(b) Security Common stock, par value $0.01 per share  
Trading Symbol HAPN  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   115,407,464
Entity Central Index Key 0001409970  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Transition Report false