XML 52 R1.htm IDEA: XBRL DOCUMENT v3.25.4
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 23, 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 001-36177    
Registrant Name Crescent Biopharma, Inc.    
Entity Incorporation, State or Country Code E9    
Entity Tax Identification Number 06-1686563    
Entity Address, Address Line One 300 Fifth Avenue    
Entity Address, City or Town Waltham    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02451    
City Area Code 617    
Local Phone Number 460-5595    
Title of 12(b) Security Ordinary Shares, $0.001 par value per share    
Trading Symbol CBIO    
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 false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 177.2
Entity Common Stock, Shares Outstanding   27,556,767  
Entity Central Index Key 0001253689    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Fiscal Year Focus 2025