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Document and Entity Information
May 31, 2026
Cover [Abstract]  
Entity Registrant Name Rallybio Corp
Security Exchange Name NASDAQ
Amendment Flag false
Entity Central Index Key 0001739410
Document Type 8-K
Document Period End Date May 31, 2026
Entity Incorporation State Country Code DE
Entity File Number 001-40693
Entity Tax Identification Number 85-1083789
Entity Address, Address Line One 234 Church Street
Entity Address, City or Town New Haven
Entity Address, State or Province CT
Entity Address, Postal Zip Code 06510
City Area Code (203)
Local Phone Number 859-3820
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.0001 per share
Trading Symbol RLYB
Entity Emerging Growth Company true
Entity Ex Transition Period false