Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Nov. 12, 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  
Current Fiscal Year End Date --12-31  
Entity File Number 001-38938  
Entity Registrant Name Stoke Therapeutics, Inc.  
Entity Central Index Key 0001623526  
Entity Tax Identification Number 47-1144582  
Entity Address, Address Line One 45 Wiggins Ave  
Entity Address, City or Town Bedford  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 01730  
City Area Code 781  
Local Phone Number 430-8200  
Trading Symbol STOK  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   32,729,777
Entity Incorporation State Country Code DE  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes  
Document Quarterly Report true  
Document Transition Report false