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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
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 |  | Straight-line over 3 years
Fixtures and fittings |  | Straight-line over 5 years, or, for non-removable items, the remaining term of an associated lease, whichever is shorter
Right of use assets |  | Straight-line over the lease terms, which are between two and five years, or the estimated useful lives of the assets, whichever is shorter
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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