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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 15, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39321    
Entity Registrant Name AVIDITY BIOSCIENCES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-1336960    
Entity Address, Address Line One 10578 Science Center Drive    
Entity Address, Address Line Two Suite 125    
Entity Address, City or Town San Diego    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92121    
City Area Code 858    
Local Phone Number 401-7900    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol RNA    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 811.3
Entity Common Stock, Shares Outstanding   79,719,473  
Documents Incorporated by Reference
Certain sections of the registrant’s definitive proxy statement for the 2024 annual meeting of stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Form 10-K are incorporated by reference into Part III of this Form 10-K.
    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001599901    
Amendment Flag false