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 Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
ft²
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jul. 31, 2021
ft²
Dec. 31, 2020
USD ($)
Sublease Agreement            
Loss Contingencies [Line Items]            
Security deposit $ 0.9   $ 0.9 $ 0.9   $ 0.9
Sublease Agreement | Five Prime Therapeutics, Inc. (the "Sublessor")            
Loss Contingencies [Line Items]            
Lease expiration Date   Dec. 31, 2027        
Aggregate estimated base rent payments due   $ 45.5        
Area of Sublease Premises | ft²   115,466        
Operating lease, expense     $ 1.1 $ 2.2    
Lease base rent abatement   $ 5.2        
San Carlos Lease | California            
Loss Contingencies [Line Items]            
Lease extension period 5 years          
Lease expiration Date Jul. 31, 2026          
Lease renewal term 5 years   5 years 5 years    
Aggregate estimated base rent payments due $ 4.2   $ 4.2 $ 4.2    
Industrial Lease | California            
Loss Contingencies [Line Items]            
Lease extension period 5 years          
Lease expiration Date Jun. 30, 2026          
Lease renewal term 5 years   5 years 5 years    
Aggregate estimated base rent payments due $ 4.3   $ 4.3 $ 4.3    
Initial Premises | Sublease Agreement | Five Prime Therapeutics, Inc. (the "Sublessor") | Subsequent Event            
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