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Commitments and Contingencies - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease expense:    
Operating lease expense $ 210 $ 225
Finance lease expense:    
Depreciation of right-of-use assets 127 116
Interest expense on lease liabilities 4 9
Total lease expense 341 350
Cash payment information:    
Operating cash used for operating leases 204 213
Financing cash used for financing leases 117 131
Total cash paid for amounts included in the measurement of lease liabilities $ 321 $ 344