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Changes in Non-cash Working Capital Items - Summary of Change in Non-cash Working Capital Items (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Cash Flow Statement [abstract]    
Trade receivables $ (46) $ (1,059)
Inventories (5,180) (1,197)
Inventories reclassified to biological asset (659) 306
Other receivables 172 (1,396)
Income taxes payable 68 (246)
Prepaid expenses and deposits 734 41
Trade payables 1,440 394
Accrued liabilities (121) (955)
Other assets, net of other liabilities 42 (305)
Changes in non-cash working capital items $ (3,550) $ (4,417)