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Commitments - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Lease expense:      
Operating lease expense $ 55 $ 109  
Finance lease expense:      
Depreciation of right-of-use assets 28 56  
Interest expense on lease liabilities 6 12  
Total lease expense 89 177  
Cash payment information:      
Operating cash used for operating leases 55 109  
Financing cash used for financing leases 20 28 $ 0
Total cash paid for amounts included in the measurement of lease liabilities $ 75 $ 137