Segmented Information - Summary of Long-lived Assets Consisting of Property, Plant and Equipment, Net of Accumulated Depreciation, Attributed to Geographic Regions Based On Their Physical Location (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 65,707	$ 39,985
CANADA [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	57,065	39,086
Others Countries [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 8,642	$ 899