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Leases - Narrative (Details)
ft² in Thousands, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
ft²
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]          
Lease cost   $ 9.9 $ 20.7 $ 18.4  
Variable lease expense   1.8 $ 3.2 2.6  
Short-term lease expense   $ 0.1   $ 0.2  
Rent expense (prior to adoption of ASU 2016-02)         $ 19.7
Operating lease weighted average remaining lease term 8 years 8 months 12 days   8 years 8 months 12 days    
Operating lease weighted average discount rate 5.10%   5.10%    
South San Francisco, California          
Lessee, Lease, Description [Line Items]          
Operating lease area (sq ft) | ft² 63        
Minimum          
Lessee, Lease, Description [Line Items]          
Remaining lease terms 1 year   1 year    
Maximum          
Lessee, Lease, Description [Line Items]          
Remaining lease terms 14 years   14 years