Leases - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lessee Lease Description [Line Items]
Operating lease expense	$ 61,000
Variable lease expense	20,000
Short term leases, rent expense	$ 13,000	$ 27,000
Laboratory and Office Facilities | Bothell, Washington
Lessee Lease Description [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
Laboratory and Office Facilities | Bothell, Washington | Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease initial term	6 years 6 months
Laboratory and Office Facilities | Bothell, Washington | Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease initial term	7 years
Laboratory and Office Facilities | University of Washington, Seattle
Lessee Lease Description [Line Items]
Operating lease initial term	12 months