Commitments and Contingencies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021
Lessee Lease Description [Line Items]
Lease arrangement, contractual expiration period, beginning year	2024-04
Lease arrangement, contractual expiration period, ending year	2030-04
Weighted-average remaining lease term	7 years 3 months 18 days
Weighted-average incremental borrowing rate	10.72%
Seattle Operating Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, renew period	5 years
Lessee, operating lease, existence of option to extend [true false]	true
Lessee, operating lease, option to extend	The Seattle and South San Francisco lease agreements provide the Company with the option to renew for an additional period of five years.
South San Francisco Operating Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, renew period	5 years
Lessee, operating lease, existence of option to extend [true false]	true
Lessee, operating lease, option to extend	The Seattle and South San Francisco lease agreements provide the Company with the option to renew for an additional period of five years.