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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 02, 2021
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus FY  
Trading Symbol ALVR  
Entity Registrant Name ALLOVIR, INC.  
Entity Central Index Key 0001754068  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Document Annual Report true  
Document Transition Report false  
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 Public Float   $ 1,286,188,221.08
Entity Common Stock, Shares Outstanding   65,106,873
Security12b Title Common Stock, par value $0.0001 per share  
Security Exchange Name NASDAQ  
Entity File Number 001-39409  
Entity Incorporation State Country Code DE  
Entity Tax Identification Number 83-1971007  
Entity Address Address Line1 139 Main Street  
Entity Address, Address Line Two Suite 500  
Entity Address City Or Town Cambridge  
Entity Address State Or Province MA  
Entity Address Postal Zip Code 02142  
City Area Code 617  
Local Phone Number 433-2605  
Documents Incorporated by Reference

Portions of the Proxy Statement for the registrant’s 2021 Annual Meeting of Stockholders, or the Proxy Statement, which the Registrant intends to file pursuant to Regulation 14A with the Securities and Exchange Commission not later than 120 days after the Registrant’s fiscal year end of December 31, 2020, are incorporated by reference into Part III of this Annual Report on Form 10-K.