XML 10 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2021
Nov. 05, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Trading Symbol DSGN  
Entity Registrant Name Design Therapeutics, Inc.  
Entity Central Index Key 0001807120  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
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   55,662,501
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Entity File Number 001-40288  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 82-3929248  
Entity Address, Address Line One 6005 Hidden Valley Road  
Entity Address, Address Line Two Suite 110  
Entity Address, City or Town Carlsbad  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92011  
City Area Code 858  
Local Phone Number 293-4900  
Document Transition Report false  
Document Quarterly Report true