v3.26.1
Cover Page
 6 Months Ended
Jun. 30, 2026
shares
Document Information [Line Items]  
Document Type 10-Q
Document Quarterly Report true
Document Transition Report false
Entity Interactive Data Current Yes
Amendment Flag false
Document Period End Date Jun. 30, 2026
Document Fiscal Year Focus 2026
Entity Registrant Name Harvard Ave Acquisition Corporation
Entity Incorporation, State or Country Code E9
Entity Central Index Key 0002042460
Entity File Number 001-42887
Entity Tax Identification Number 00-0000000
Current Fiscal Year End Date --12-31
Document Fiscal Period Focus Q2
Entity Current Reporting Status Yes
Entity Address, Address Line One 3rd Floor, 166 Yeongsin-ro
Entity Address, Address Line Two Yeongdengpo-gu
Entity Address, City or Town Seoul
Entity Address, Country KR
Entity Address, Postal Zip Code 07362
City Area Code +82
Local Phone Number 10-8781-0823
Entity Shell Company true
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Units, consisting of one Class A ordinary share, $0.0001 par value, and one Right to acquire one-tenth of one Class A ordinary share  
Document Information [Line Items]  
Title of 12(b) Security Units, consisting of one Class A ordinary share, $0.0001 par value, and one right to acquire one-tenth of one Class A ordinary share
Trading Symbol HAVAU
Security Exchange Name NASDAQ
Class A ordinary shares, $0.0001 par value  
Document Information [Line Items]  
Title of 12(b) Security Class A ordinary shares, $0.0001 par value
Trading Symbol HAVA
Security Exchange Name NASDAQ
Rights, each whole right to acquire one-tenth of one Class A ordinary share  
Document Information [Line Items]  
Title of 12(b) Security Rights, each whole right to acquire one-tenth of one Class A ordinary share
Trading Symbol HAVAR
Security Exchange Name NASDAQ
Class A Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 15,859,856
Class B Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 4,833,333