Document and Entity Information - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Mar. 08, 2024

Jun. 30, 2023

Cover [Abstract]

Document Type

10-K

Amendment Flag

false

Document Period End Date

Dec. 31, 2023

Document Fiscal Year Focus

2023

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

ICFR Auditor Attestation Flag

false

Entity Shell Company

false

Entity Public Float

$ 265.4

Entity Common Stock, Shares Outstanding

114,869,175

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

1100 Winter Street

Entity Address City Or Town

Waltham

Entity Address State Or Province

MA

Entity Address Postal Zip Code

02451

City Area Code

617

Local Phone Number

433-2605

Document Financial Statement Error Correction Flag

false

Documents Incorporated by Reference

Portions of the Proxy Statement for the registrant’s 2024 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, 2023, are incorporated by reference into Part III of this Annual Report on Form 10-K.

Auditor Firm ID

34

Auditor Name

Deloitte & Touche LLP

Auditor Location

Boston, MA, USA