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Property and Equipment - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Property Plant And Equipment [Line Items]        
Depreciation expense $ 106,000 $ 105,000 $ 348,000 $ 373,000
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