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Commitments - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Lease expense:      
Operating lease expense $ 56 $ 169  
Finance lease expense:      
Depreciation of right-of-use assets 32 85  
Interest expense on lease liabilities 2 7  
Total lease expense 90 261  
Cash payment information:      
Operating cash used for operating leases 38 147  
Financing cash used for financing leases 1 75 $ 0
Total cash paid for amounts included in the measurement of lease liabilities $ 39 $ 222