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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Prepaid Expense And Other Assets Current [Abstract] |  |
Clinical trial expenses | $ 725 |
Insurance premiums | 589 | $ 140
Security deposit | 51 | 51
Income tax and VAT receivable | 31 | 579
Other | 363 | 128
Total prepaid expenses and other current assets | $ 1,759 | $ 898

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