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Note 8 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Compensation and related expenses $ 5,726 $ 7,345
Professional fees 2,904 3,438
Clinical trial costs 1,746 1,429
Financing lease liability - current 119 148
Other 1,448 996
Total 13,460 14,793
Accrued Expenses and Other Current Liabilities [Member]    
Operating lease liability - current $ 1,517 $ 1,437