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Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Trade accounts payable $ 260 $ 668
Other accounts payable 187 136
Accrued salaries and compensation 647 454
Accrued payroll taxes 121 120
Other accrued non-income related taxes 89 67
Accrued legal and professional fees 979 156
Deferred revenue 60 27
Other accrued liabilities 135 91
Accounts Payable and Accrued Liabilities, Current $ 2,478 $ 1,719