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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Prepaid Expense And Other Assets Current [Abstract] |  |
Outside consultants | $ 249 |
Taxes receivable | 145 | $ 29
Insurance premiums | 52 | 421
Security deposit | 51 | 50
Software | 19 | 15
Financing costs |  | 70
Other | 11 | 115
Total prepaid expenses and other current assets | $ 527 | $ 700

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