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Commitments and Contingencies - Lease information (Details)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2019
USD ($)
ft²
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Leases        
Notice period for cancellation of commitment agreement   90 days    
Area leased (in square feet) | ft² 27,830      
Option to extend true      
Term of option to extend 5 years      
Maximum amount of tenant improvements to be funded by landlord $ 4.9      
Reduction in future minimum lease payments $ 4.9      
Reimbursement received     $ 2.9 $ 2.0
Restricted cash        
Leases        
Letter of credit for the benefit of landlord   $ 1.6 $ 1.6