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Significant Accounting Policies - Summary of Depreciation Over the Estimated Useful Lives of Each Significant Component (Detail)
 12 Months Ended
Dec. 31, 2018
Computing Equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives or amortisation rates 55.00%
Useful lives or amortisation rates, intangible assets other than goodwill 55% declining balance basis
Software [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives or amortisation rates 55.00%
Useful lives or amortisation rates, intangible assets other than goodwill 55% declining balance basis
Field Equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives or depreciation rates 20.00%
Estimated useful lives or depreciation rates 20% declining balance basis
Leasehold Improvements [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives or depreciation rates Lease term
Road [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives or depreciation, straight-line basis 5 years
Estimated useful lives or depreciation rates 5-year straight-line basis