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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Mar. 01, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Entity Central Index Key 0001739410    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Securities Act File Number 001-40693    
Entity Registrant Name RALLYBIO CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 85-1083789    
Entity Address, Address Line One 234 Church Street    
Entity Address, Address Line Two Suite 1020    
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    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol RLYB    
Security Exchange Name NASDAQ    
Document Annual Report true    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Document Transition Report false    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Shell Company false    
Entity Public Float     $ 120.7
Entity Common Stock, Shares Outstanding   38,075,024  
ICFR Auditor Attestation Flag false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Definitive Proxy Statement for its 2023 Annual Meeting of Stockholders scheduled to be held on May 17, 2023, which Definitive Proxy will be filed with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year end of December 31, 2022 are incorporated by reference into Part II and Part III of this Annual Report on Form 10-K.

    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Hartford, Connecticut