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Taxes (Narrative) (Details) $ in Thousands, £ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 30, 2019 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 USD ($)
Taxes |  |  |  |  |  |
Income tax credits - UK research and development |  |  | $ 1,238 | $ 1,299 |  |
Income tax benefit |  |  | (1,236) | (1,296) |  |
Valuation allowance for deferred tax assets | $ 37,370 |  |  | 37,370 |  | $ 42,063
Increase in valuation allowance |  |  | $ 4,700 |  |  |
Federal |  |  |  |  |  |
Taxes |  |  |  |  |  |
NOLs carryforward | 400 |  |  | 400 |  | 1,100
State |  |  |  |  |  |
Taxes |  |  |  |  |  |
NOLs carryforward | 19,800 |  |  | 19,800 |  | 20,500
Operating loss carryforward, expiration date |  |  | Dec. 31, 2028 |  |  |
Foreign Country - UK |  |  |  |  |  |
Taxes |  |  |  |  |  |
NOLs carryforward | $ 201,700 |  |  | $ 201,700 |  | $ 212,400
Percentage of tax rate adopted in respect of deferred tax assets measurement |  |  | 50.00% |  |  |
UK corporate income tax rate | 17.00% | 19.00% | 19.00% |  |  |
Increase in deferred tax assets |  |  | $ 3,900 |  |  |
Annual NOL allowance restriction | £ |  |  |  |  | £ 5 |
Increase in valuation allowance |  |  | $ 3,900 |  |  |

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