Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Summary of Significant Accounting Policies - Estimated Useful Life of Assets (Detail)

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Summary of Significant Accounting Policies - Estimated Useful Life of Assets (Detail)
 12 Months Ended
Dec. 31, 2018
Computer Equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 3 years
Furniture and fixture [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 3 years
Furniture and fixture [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 5 years
Leasehold Improvements [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives Term of the lease