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Geographic Information (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue |  |
Net loss | (8,445) | (7,830)
Assets | 36,802 | 15,308
Long Lived Assets, net | 106 | 27
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net loss | (8,015) | (7,391)
Assets | 4,480 | 3,838
Long Lived Assets, net | 105 | 24
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net loss | (430) | (439)
Assets | 32,322 | 11,470
Long Lived Assets, net | $ 1 | $ 3

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