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Leases - Schedule of Future Minimum Payments under Facility Operating Lease (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Leases, Operating [Abstract]    
2019 $ 55  
2020 187  
Total future lease payments 242  
Less: imputed interest (26)  
Present value of lease liabilities $ 216 $ 400