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Note 8 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Compensation and related expenses $ 7,457 $ 9,523
Professional fees 2,967 3,590
Clinical trial costs 2,014 1,961
Other 1,145 1,059
Total 15,233 17,847
Accrued Expenses and Other Current Liabilities [Member]    
Operating lease liability - current 1,528 1,526
Financing lease liability - current $ 122 $ 188