Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Nov. 01, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol SLDB  
Entity Registrant Name Solid Biosciences Inc.  
Entity Current Reporting Status Yes  
Entity Central Index Key 0001707502  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Common Stock, Shares Outstanding   45,987,571
Entity File Number 001-38360  
Entity Tax Identification Number 90-0943402  
Entity Address, Address Line One 141 Portland Street, Fifth Floor  
Entity Address, City or Town Cambridge  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02139  
City Area Code 617  
Local Phone Number 337-4680  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock $0.001 par value per share  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code DE  
Document Quarterly Report true  
Document Transition Report false