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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 19, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Entity Registrant Name Athira Pharma, Inc.    
Entity Central Index Key 0001620463    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-3368487    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol ATHA    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity File Number 001-39503    
Entity Shell Company false    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Address Address Line1 18706 North Creek Parkway,    
Entity Address Address Line2 Suite 104    
Entity Address City Or Town Bothell,    
Entity Address State Or Province WA    
Entity Address Postal Zip Code 98011    
City Area Code 425    
Local Phone Number 620-8501    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Security Exchange Name NASDAQ    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Common Stock, Shares Outstanding   38,326,652  
Entity Public Float     $ 96.3
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the definitive proxy statement to be delivered to stockholders in connection with the 2024 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K. Such proxy statement will be filed with the Securities and Exchange Commission not later than 120 days following the end of the Registrant’s fiscal year ended December 31, 2023.

    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Seattle, Washington