XML 23 R1.htm IDEA: XBRL DOCUMENT v3.26.1
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 06, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity 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, 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    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 10.6
Entity Common Stock, Shares Outstanding (in shares)   5,289,675  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
None.
    
Entity Central Index Key 0001739410    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false