Document And Entity Information
Oct. 22, 2019
Cover [Abstract]  
Entity Registrant Name bluebird bio, Inc.
Document Type 8-K
Amendment Flag false
Entity Central Index Key 0001293971
Document Period End Date Oct. 22, 2019
Entity Emerging Growth Company false
Title of 12(b) Security Common Stock (Par Value $0.01)
Trading Symbol BLUE
Security Exchange Name NASDAQ
Entity File Number 001-35966
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 13-3680878
Entity Address, Address Line One 60 Binney Street
Entity Address, City or Town Cambridge
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02142
City Area Code 339
Local Phone Number 499-9300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false