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Note 6 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Compensation | $ 1,747,880 | $ 2,966,139
Deferred revenue | 10,630,746 | 2,298,341
Interest payable | 0 | 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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