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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Sep. 11, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35966    
Entity Registrant Name bluebird bio, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-3680878    
Entity Address, Address Line One 455 Grand Union Boulevard    
Entity Address, City or Town Somerville    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02145    
City Area Code 339    
Local Phone Number 499-9300    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol BLUE    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Interactive Data Current No    
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] true    
Document Financial Statement Restatement Recovery Analysis [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 346,285,765
Entity Common Stock, Shares Outstanding   193,913,585  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
None.
    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001293971