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Significant Accounting Policies (Tables) | 12 Months Ended
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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

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- Definition Summary of amortization method and amortization period for principal categories of intangible assets explanatory. + References No definition available. + Details
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