v3.26.1
Cover
May 14, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 14, 2026
Entity File Number 001-42392
Entity Registrant Name MERLIN, INC.
Entity Central Index Key 0002028707
Entity Tax Identification Number 98-1797826
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 100 Causeway St.
Entity Address, Address Line Two Floor 23
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02114
City Area Code 857
Local Phone Number 201-3979
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value $0.0001 per share
Trading Symbol MRLN
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false