v3.26.1
Cover - USD ($)
12 Months Ended
Dec. 31, 2025
Mar. 13, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Documents Incorporated by Reference [Text Block] None.    
Entity Registrant Name ART TECHNOLOGY ACQUISITION CORP.    
Entity Central Index Key 0002086545    
Entity File Number 001-43040    
Entity Tax Identification Number 98-1881297    
Entity Incorporation, State or Country Code E9    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company true    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Public Float     $ 0
Entity Address, Address Line One 2929 Arch Street    
Entity Address, Address Line Two Suite 1703    
Entity Address, City or Town Philadelphia    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19104    
City Area Code (267)    
Local Phone Number 703-4396    
Units, each consisting of one Class A ordinary share and one-fourth of one redeemable warrant      
Document Information [Line Items]      
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-fourth of one redeemable warrant    
Trading Symbol ARTCU    
Security Exchange Name NASDAQ    
Class A ordinary shares, par value $0.0001 per share      
Document Information [Line Items]      
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share    
Trading Symbol ARTC    
Security Exchange Name NASDAQ    
Warrants, each whole warrant exercisable for one Class A ordinary share      
Document Information [Line Items]      
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share    
Trading Symbol ARTCW    
Security Exchange Name NASDAQ    
Class A Ordinary Shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   26,125,000  
Class B Ordinary Shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   8,708,333