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Income Tax Credit - Schedule of Reconciliation of Accounting Loss per Statement of Operations (Parenthetical) (Details) |  |  | 12 Months Ended
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Apr. 01, 2017 | Oct. 26, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.K. |  |  |  |  |
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Line Items] |  |  |  |  |
Applicable tax rate | 19.00% | 20.00% | 19.25% | 20.00% | 20.25%

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