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Commitments and Contingencies - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Lease expense:        
Operating lease expense $ 53 $ 55 $ 108 $ 109
Finance lease expense:        
Depreciation of right-of-use assets 31 28 63 56
Interest expense on lease liabilities 1 6 3 12
Total lease expense 85 89 174 177
Cash payment information:        
Operating cash used for operating leases 48 55 99 109
Financing cash used for financing leases 33 20 51 28
Total cash paid for amounts included in the measurement of lease liabilities $ 81 $ 75 $ 150 $ 137