v3.26.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2026
Jul. 24, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Registrant Name Dyne Therapeutics, Inc.  
Entity Central Index Key 0001818794  
Entity File Number 001-39509  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 36-4883909  
Entity Address, Address Line One 1560 Trapelo Road  
Entity Address, City or Town Waltham  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02451  
City Area Code 781  
Local Phone Number 786-8230  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Trading Symbol DYN  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   186,746,431