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v3.8.0.1

Selected Balance Sheet Information (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Current Assets [Line Items] |  |
Prepaid insurance | $ 351 | $ 358
Other prepaid expenses | 290 | 185
Prepaid conferences, travel and other expenses | 94 | 295
Clinical consulting services refund receivable | 46 | 0
Prepaid clinical research organizations | 46 | 1,677
Total | $ 827 | $ 2,515

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