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Capital Disclosures - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of capital disclosure [line items]      
Outstanding letters of credit $ 38 $ 261  
Operating loan outstanding amount   $ 2,000 $ 0
Operating loan borrowing base amount 11,509    
Maximum [member]      
Disclosure of capital disclosure [line items]      
Operating loan facility amount $ 13,000