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Selected Balance Sheet Information (Details 2) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accrued Expenses [Line Items] |  |
Accrued clinical consulting services | $ 1,167 | $ 658
Accrued vendor payments | 243 | 193
Accrued manufacturing costs | 64 | 661
Other accrued expenses | 11 | 14
Total | $ 1,485 | $ 1,526

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