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Document And Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Mar. 04, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name CODIAK BIOSCIENCES, INC.    
Entity Central Index Key 0001659352    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   22,493,867  
Entity Public Float     $ 412,718,249
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol CDAK    
Security Exchange Name NASDAQ    
Entity File Number 001-39615    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-4926530    
Entity Address, Address Line One 35 Cambridge Park Drive    
Entity Address, Address Line Two Suite 500    
Entity Address, City or Town Cambridge    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02140    
City Area Code 617    
Local Phone Number 949-4100    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

The registrant intends to file a definitive proxy statement pursuant to Regulation 14A relating to the 2022 Annual Meeting of Stockholders within 120 days of the end of the registrant’s fiscal year ended December 31, 2021. Portions of such definitive proxy statement are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.

    
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location Boston, Massachusetts