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Commitments - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Lease expense:    
Operating lease expense $ 55  
Finance lease expense:    
Depreciation of right-of-use assets 32  
Interest expense on lease liabilities 2  
Total lease expense 89  
Cash payment information:    
Operating cash used for operating leases 51  
Financing cash used for financing leases 18 $ 28
Total cash paid for amounts included in the measurement of lease liabilities $ 69