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Leases - Schedule of Maturities of lease liabilities (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Leases [Abstract]  
2019 (6 months ended December 31) $ 33
2020 59
2021 54
2022 9
Total lease payments 155
Less: imputed interest 13
Present Value of lease liabilities $ 142