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Taxes (Narrative) (Details) $ in Thousands, £ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 USD ($)
Taxes |  |  |  |
Income tax credits - UK research and development | $ 1,299 | $ 1,342 |  |
US corporate income tax rate | 21.00% | 35.00% |  |
Valuation allowance for deferred tax assets |  | $ 35,426 |  | $ 37,370
Reduction in deferred tax assets | $ (4,400) |  |  |
Increase in valuation allowance | $ 1,900 |  |  |
Federal |  |  |  |
Taxes |  |  |  |
NOLs carryforward |  | 0 |  | 400
Foreign Country - UK |  |  |  |
Taxes |  |  |  |
NOLs carryforward |  | $ 191,200 |  | 201,700
Annual NOL allowance restriction | £ |  |  | £ 5.0 |
Percentage of profits that can be covered by losses brought forward in excess of the annual allowance restriction | 50.00% |  |  |
State |  |  |  |
Taxes |  |  |  |
NOLs carryforward |  |  |  | $ 19,800
Operating loss carryforward, expiration date | Dec. 31, 2028 |  |  |

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