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Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives and Depreciation Calculation Methods (Detail)
 12 Months Ended
Dec. 31, 2018
Engineering equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation method Straight-line
Office equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation method Straight-line
Other [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation method Straight-line
Leasehold improvements [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation method Straight-line over term of lease to a maximum of 15 years or the improvement's economic life
Estimated Lives 15 years
Bottom of range [member] | Engineering equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Lives 5 years
Bottom of range [member] | Office equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Lives 5 years
Bottom of range [member] | Other [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Lives 5 years
Top of range [member] | Engineering equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Lives 10 years
Top of range [member] | Office equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Lives 10 years
Top of range [member] | Other [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Lives 50 years