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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Summary Of Significant Accounting Policies [Abstract]  
Summary of Depreciation on Property, Plant and Equipment Over Their Expected Useful Economic Life

Depreciation is provided on property, plant and equipment over their expected useful economic life as follows:

 

Asset class

 

Depreciation method and period

Office and computer equipment

Fixtures and fittings

 

Straight-line over 3 years

Straight-line over 5 years

 
Summary of Amortization Method and Amortization Period for the Principal Categories of Intangible Assets

The amortization method and amortization period for the principal categories of intangible assets are follows:

 

Asset class

 

Amortization method and period

Patents

 

Straight-line over 20 years

Computer software

 

Straight-line between 3 and 5 years