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Note 10 - Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31,
|  | 2017 |  | 2016
Compensation and related expenses |  | $ | 2,893 |  |  | $ | 3,089 |
Facility construction costs |  |  | - |  |  |  | 804 |
Research grants |  |  | 419 |  |  |  | 463 |
Clinical trial costs |  |  | 2,318 |  |  |  | 227 |
Professional fees |  |  | 448 |  |  |  | 802 |
Deferred rent |  |  | - |  |  |  | 231 |
Other |  |  | 248 |  |  |  | 880 |
Total |  | $ | 6,326 |  |  | $ | 6,496 |

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