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Taxes (Narrative) (Details) $ in Thousands, £ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 GBP (£)
Taxes |  |  |
Income tax credits | $ 3,800 | $ 1,200 |
Income tax credits - UK research and development | 3,849 | 1,238 |
Income tax benefit | (3,847) | (1,236) |
Valuation allowance for deferred tax assets | 56,730 | 42,063 |
Increase in valuation allowance | 14,700 |  |
Federal |  |  |
Taxes |  |  |
NOLs carryforward | 2,500 | 1,100 |
State |  |  |
Taxes |  |  |
NOLs carryforward | $ 21,100 | 20,500 |
Operating loss carryforward, expiration date | Dec. 31, 2028 |  |
Foreign |  |  |
Taxes |  |  |
NOLs carryforward | $ 218,500 | $ 212,400 |
Percentage of tax rate adopted in respect of deferred tax assets measurement | 50.00% |  |
Annual NOL allowance restriction | £ |  |  | £ 5

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