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Note 8 - Accrued Expenses (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | March 31, 2022 |  |  | December 31, 2021 |
Compensation and related expenses |  | $ | 7,457 |  |  | $ | 9,523 |
Professional fees |  |  | 2,967 |  |  |  | 3,590 |
Operating lease liability - current |  |  | 1,528 |  |  |  | 1,526 |
Clinical trial costs |  |  | 2,014 |  |  |  | 1,961 |
Financing lease liability - current |  |  | 122 |  |  |  | 188 |
Other |  |  | 1,145 |  |  |  | 1,059 |
Total |  | $ | 15,233 |  |  | $ | 17,847 |

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