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Document And Entity Information
Jul. 28, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 28, 2025
Entity Registrant Name METSERA, INC.
Entity Central Index Key 0002040807
Entity Emerging Growth Company true
Entity File Number 001-42489
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 92-0931552
Entity Address, Address Line One 3 World Trade Center
Entity Address, Address Line Two 175 Greenwich Street
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 784-6595
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Ex Transition Period false
Title of 12(b) Security Common Stock, par value $0.00001 per share
Trading Symbol MTSR
Security Exchange Name NASDAQ