Income taxes - Change in Tax Rate (Details) $ in Thousands, £ in Millions |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Apr. 01, 2020 |
Apr. 01, 2017 |
Dec. 31, 2018
GBP (£)
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Dec. 31, 2018
USD ($)
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Dec. 31, 2017
USD ($)
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Dec. 31, 2016
USD ($)
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| Income taxes | ||||||
| Net operating loss | $ (82,365) | $ (80,661) | $ (72,799) | |||
| Annual allowance | £ | £ 5 | |||||
| Percentage on taxable profit | 50.00% | |||||
| Her Majesty's Revenue and Customs (HMRC) | ||||||
| Income taxes | ||||||
| Tax rate (as a percent) | 19.00% | 19.00% | 19.00% | 19.25% | 20.00% | |
| Tax rate, deferred taxes (as a percent) | 17.00% | 17.00% | ||||
| Operating Loss Carryforwards | $ 175,600 | |||||
| Expenditure credit carryforward | $ 600 | |||||
| Her Majesty's Revenue and Customs (HMRC) | Forecast | ||||||
| Income taxes | ||||||
| Tax rate (as a percent) | 17.00% | |||||
| Internal Revenue Service (IRS) | ||||||
| Income taxes | ||||||
| Tax rate (as a percent) | 21.00% | 21.00% | 34.00% | 34.00% | ||
| Tax rate, deferred taxes (as a percent) | 21.00% | 21.00% | ||||
| Tax credit carryforwards | $ 4,200 | |||||
| Tax credit carried forward period | 20 years | 20 years | ||||
| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to deferred taxes. No definition available.
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| X | ||||||||||
- Definition Amount of expenditure credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. No definition available.
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| X | ||||||||||
- Definition Amount of annual allowance for operating loss carryforwards and tax credit carryforward. No definition available.
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| X | ||||||||||
- Definition "Percentage on taxable profit for operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, and the amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws." No definition available.
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| X | ||||||||||
- Definition It represents the period of tax credit carryforwards can be carried forward. No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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