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Leases - Schedule of Maturities of Operating Lease Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
2019 $ 36  
2020 67  
2021 49  
2022 4  
Total undiscounted operating lease payments 156  
Less: imputed interest (9)  
Present value of operating lease liabilities $ 147 $ 200