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Basis of Preparation - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Basis of Preparation [Line Items]      
Average incremental borrowing rate   6.50%  
Lease liabilities $ 1,349    
Other long term liabilities [member]      
Basis of Preparation [Line Items]      
Lease liabilities   $ 200  
Property, plant and equipment [member]      
Basis of Preparation [Line Items]      
Right-of-use assets $ 580 $ 200