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Commitments and Contingencies - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lease expense:    
Operating lease expense $ 225  
Finance lease expense:    
Depreciation of right-of-use assets 116  
Interest expense on lease liabilities 9  
Total lease expense 350  
Cash payment information:    
Operating cash used for operating leases 213  
Financing cash used for financing leases 131 $ 0
Total cash paid for amounts included in the measurement of lease liabilities $ 344