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Leases - Narrative (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
ft²
renewal_option
Jun. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]    
Right-of-use assets obtained in exchange for lease obligations $ 14,379 $ 0
Fremont facility amendment    
Lessee, Lease, Description [Line Items]    
Office space area (sq ft) | ft² 72,500  
Right-of-use assets obtained in exchange for lease obligations $ 11,900  
Waltham facility    
Lessee, Lease, Description [Line Items]    
Office space area (sq ft) | ft² 12,864  
Right-of-use assets obtained in exchange for lease obligations $ 1,600  
Existence of option to extend true  
Number of options to extend | renewal_option 1  
Term of lease extension 5 years