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Operating Leases - ROU Assets and Lease Liability Obligations - Schedule of Future Minimum Lease Payments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
Remainder of 2020 $ 167  
2021 343  
2022 29  
Total minimum lease payments 539  
Less: amount representing interest (25)  
Total lease liability obligations $ 514 $ 662