Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Commitments And Contingencies [Line Items]
Operating lease expense	$ 85,000		$ 146,000
Variable lease expense	20,000		40,000
Short term leases, rent expense	$ 0	$ 12,000	$ 13,000	$ 39,000
Laboratory and Office Facilities | Bothell, Washington
Commitments And Contingencies [Line Items]
Operating lease expiration month and year			2027-08
Operating lease existence of option to extend			true
Operating lease, additional term of contract	5 years		5 years
Laboratory and Office Facilities | Bothell, Washington | Minimum [Member]
Commitments And Contingencies [Line Items]
Operating lease initial term	6 years 3 months 18 days		6 years 3 months 18 days
Laboratory and Office Facilities | Bothell, Washington | Maximum [Member]
Commitments And Contingencies [Line Items]
Operating lease initial term	7 years		7 years
Laboratory and Office Facilities | University of Washington, Seattle
Commitments And Contingencies [Line Items]
Operating lease initial term	12 months		12 months
Wang V. Athira Pharma Inc.,
Commitments And Contingencies [Line Items]
Lawsuit filing date			June 25, 2021
Name of plaintiff			Fan Wang and Hang Gao
Jawandha V. Athira Pharma Inc.,
Commitments And Contingencies [Line Items]
Lawsuit filing date			June 25, 2021
Name of plaintiff			Harshdeep Jawandha
Slyne V. Athira Pharma Inc.,
Commitments And Contingencies [Line Items]
Lawsuit filing date			June 25, 2021
Name of plaintiff			Timothy Slyne and Tai Slyne