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Note 9 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued expenses $ 495 $ 465
Accrued clinical trial costs 276 74
Grant liability 645 663
Customer deposits 112 61
Total $ 1,528 $ 1,263