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Note 7 - Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Employee related expenses $ 6,020 $ 6,162
Royalties 741 1,419
Professional services 520 346
Rent 503 238
Clinical trials 192 688
Other accrued liabilities 1,778 2,281
Total accrued liabilities $ 9,754 $ 11,134