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Property and Equipment - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property Plant And Equipment [Line Items]        
Depreciation expense $ 100 $ 100 $ 389 $ 348
Other Property and Equipment | Minimum        
Property Plant And Equipment [Line Items]        
Property and equipment, estimated useful life     3 years  
Other Property and Equipment | Maximum        
Property Plant And Equipment [Line Items]        
Property and equipment, estimated useful life     15 years