v3.26.1
Cover
Jun. 22, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 22, 2026
Entity File Number 001-40360
Entity Registrant Name Definium Therapeutics, Inc.
Entity Central Index Key 0001813814
Entity Tax Identification Number 98-1582438
Entity Incorporation, State or Country Code A1
Entity Address, Address Line One One World Trade Center
Entity Address, Address Line Two Suite 8500
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10007
City Area Code 212
Local Phone Number 220-6633
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Shares
Trading Symbol DFTX
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false