Leases - Additional Information (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2020 ft²	Dec. 31, 2020 USD ($) ft² option	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Tenant improvement allowance			$ 8,000
Additional tenant improvements			1,500
Tenant improvement allowance receivable			900
Termination fees for lease termination	$ 500
Loss on termination of lease	300
Loss on disposal of property and equipment	$ 200		180	$ 5
Operating lease right-of-use asset			10,154	770
Finance lease right-of-use asset			$ 300	$ 300
Standby Letters of Credit
Lessee, Lease, Description [Line Items]
Security deposit						$ 500
Washington
Lessee, Lease, Description [Line Items]
Number of options to extend lease | option			2
Lease agreement extended period			5 years
Washington | Office space, principal executive offices and laboratory
Lessee, Lease, Description [Line Items]
Lease agreement, square feet of office space | ft²			33,300
Number of options to extend lease | option			2
Lease agreement extended period			5 years
Operating lease, right of use asset, increase due to remeasurement					$ 1,000
Operating lease, liability, increase due to remeasurement					$ 1,000
Washington | Office space, former principal executive offices and laboratory
Lessee, Lease, Description [Line Items]
Lease agreement, square feet of office space | ft²			6,272
Number of days advance notice must be given to terminate the lease		45 days
Canada
Lessee, Lease, Description [Line Items]
Lease agreement, square feet of office space | ft²	10,946	10,946