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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Prepaid Expense And Other Assets Current [Abstract] |  |  |
Clinical trial expenses | $ 500 |  |
Financing costs |  |  | $ 70
Insurance premiums | 54 | $ 140 | 421
Security deposit | 50 | 51 | 50
Income tax and VAT receivable | 33 | 579 | 29
Other | 227 | 128 | 130
Total prepaid expenses and other current assets | $ 864 | $ 898 | $ 700

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