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Note 6 - Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Employee related expenses $ 5,270 $ 4,317
Investment banking fees 1,750
Royalties 1,035 1,419
Other accrued liabilities 2,134 2,071
Total accrued liabilities $ 10,189 $ 7,807