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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Prepaid Expense And Other Assets Current [Abstract] |  |
Insurance premiums | $ 140 | $ 421
Financing costs |  | 70
Security deposit | 51 | 50
Income tax and VAT receivable | 579 | 29
Other | 128 | 130
Total prepaid expenses and other current assets | $ 898 | $ 700

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