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Note 6 - Accrued Expenses and Other Current Liabilities | 6 Months Ended
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Jun. 30, 2020
Notes to Financial Statements |
Accrued Expenses and Other Liabilities [Text Block] | 6. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following:
|  | As of |
|  | June 30, 2020 |  |  | December 31, 2019 |
Compensation |  | $ | 1,747,880 |  |  | $ | 2,966,139 |
Deferred revenue |  |  | 10,630,746 |  |  |  | 2,298,341 |
Interest payable |  |  | — |  |  |  | 977,724 |
Lease liability, current portion |  |  | 434,132 |  |  |  | 419,709 |
Research and development vendor costs |  |  | 298,626 |  |  |  | 707,685 |
Professional fees |  |  | 447,451 |  |  |  | 288,707 |
Vacation |  |  | 438,599 |  |  |  | 256,402 |
Other |  |  | 933,936 |  |  |  | 722,204 |
Accrued expenses and other current liabilities |  | $ | 14,931,370 |  |  | $ | 8,636,911 |

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