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Commitments and Contingencies - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Lease expense:        
Operating lease expense $ 52 $ 56 $ 160 $ 169
Finance lease expense:        
Depreciation of right-of-use assets 32 32 95 85
Interest expense on lease liabilities 1 2 4 7
Total lease expense 85 90 259 261
Cash payment information:        
Operating cash used for operating leases 56 38 155 147
Financing cash used for financing leases 42 1 93 75
Total cash paid for amounts included in the measurement of lease liabilities $ 98 $ 39 $ 248 $ 222