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Financial Instruments - Summary of Net Foreign Exchange Gain or Loss Directing Impacting Net Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial commitments [line items]    
Net foreign exchange gain (loss) $ (1,047) $ 26
Cash and cash equivalents [member]    
Disclosure of detailed information about financial commitments [line items]    
Net foreign exchange gain (loss) 839 287
Trade receivables [member]    
Disclosure of detailed information about financial commitments [line items]    
Net foreign exchange gain (loss) 328 349
Joint venture note receivable [member]    
Disclosure of detailed information about financial commitments [line items]    
Net foreign exchange gain (loss) 1,335  
Trade payables and accrued liabilities [member]    
Disclosure of detailed information about financial commitments [line items]    
Net foreign exchange gain (loss) (373) (371)
Loan payable [member]    
Disclosure of detailed information about financial commitments [line items]    
Net foreign exchange gain (loss) $ (193) $ (232)