Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.21.2
Commitments and Contingencies - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
ft²
Sep. 30, 2020
USD ($)
ft²
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
ft²
Jul. 31, 2021
ft²
Dec. 31, 2020
USD ($)
Loss Contingencies [Line Items]              
Aggregate estimated base rent payments due       $ 47,821      
Operating lease expense       6,400      
Operating lease payments       $ 4,000      
Operating lease, weighted average remaining lease term       5 years 10 months 24 days      
Operating lease, weighted average discount rate, percent       10.80%      
Deferred rent             $ 1,340
Rent expense     $ 900   $ 2,700    
Sublease Agreement              
Loss Contingencies [Line Items]              
Security deposit       $ 900     $ 900
Sublease Agreement | Five Prime Therapeutics, Inc. (the "Sublessor")              
Loss Contingencies [Line Items]              
Lease expiration Date   Dec. 31, 2027          
Aggregate estimated base rent payments due   $ 39,100 $ 39,100   $ 39,100    
Area of Sublease Premises | ft²   115,466 115,466   115,466    
Lease base rent abatement   $ 5,200 $ 5,200   $ 5,200    
San Carlos Lease | California              
Loss Contingencies [Line Items]              
Lease extension period 5 years            
Lease expiration Date Jul. 31, 2026            
Lease renewal term 5 years            
Aggregate estimated base rent payments due $ 4,200            
Industrial Lease | California              
Loss Contingencies [Line Items]              
Lease extension period 5 years            
Lease expiration Date Jun. 30, 2026            
Lease renewal term 5 years            
Aggregate estimated base rent payments due $ 4,300            
Initial Premises | Sublease Agreement | Five Prime Therapeutics, Inc. (the "Sublessor")              
Loss Contingencies [Line Items]              
Area of Sublease Premises | ft²           85,755  
Expansion Premises | Sublease Agreement | Five Prime Therapeutics, Inc. (the "Sublessor")              
Loss Contingencies [Line Items]              
Area of Sublease Premises | ft²   29,711 29,711   29,711