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Geographic Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | $ 0 | $ 843
Net loss | (7,470) | (11,791)
Assets | 26,003 | 19,662
Long Lived Assets, net | 29 | 45
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenue | 0 | 843
Net loss | (7,343) | (9,580)
Assets | 2,481 | 4,465
Long Lived Assets, net | 29 | 43
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net loss | (127) | (2,211)
Assets | 23,522 | 15,197
Long Lived Assets, net | $ 0 | $ 2

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