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Document and Entity Information
Mar. 26, 2025
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0002040807
Document Type 8-K
Document Period End Date Mar. 26, 2025
Entity Registrant Name METSERA, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-42489
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
Security 12b Title Common Stock, $0.00001 par value per share
Trading Symbol MTSR
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false