Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Feb. 23, 2021
Jun. 30, 2020
Cover [Abstract]   
Document Type10-K  
Amendment Flagfalse  
Document Period End DateDec. 31, 2020  
Document Fiscal Year Focus2020  
Document Fiscal Period FocusFY  
Trading SymbolALLK  
Entity Registrant NameAllakos Inc.  
Entity Central Index Key0001564824  
Current Fiscal Year End Date--12-31  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Filer CategoryLarge Accelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
Entity Public Float  $ 2,155.5
Entity Common Stock, Shares Outstanding 53,117,414 
ICFR Auditor Attestation Flagtrue  
Entity File Number001-38582  
Entity Tax Identification Number45-4798831  
Entity Address, Address Line One975 Island Drive  
Entity Address, Address Line TwoSuite 201  
Entity Address, City or TownRedwood City  
Entity Address, State or ProvinceCA  
Entity Address, Postal Zip Code94065  
City Area Code650  
Local Phone Number597-5002  
Entity Interactive Data CurrentYes  
Title of 12(b) SecurityCommon Stock, par value $0.001  
Security Exchange NameNASDAQ  
Document Annual Reporttrue  
Document Transition Reportfalse  
Entity Incorporation, State or Country CodeDE  
Documents Incorporated by Reference

Portions of the Registrant’s Definitive Proxy Statement relating to the registrant’s 2020 Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s 2020 fiscal year ended December 31, 2020.

  

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