v3.10.0.1
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Feb. 22, 2019
Jun. 29, 2018
Document and Entity Information      
Entity Registrant Name Voyager Therapeutics, Inc.    
Entity Central Index Key 0001640266    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 442.0
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   32,616,999  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY