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Note 6 - Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Employee related expenses $ 6,282 $ 6,592
Royalties 5,669 4,423
Professional services 1,069 387
Clinical trials 644 1,135
Other accrued liabilities 2,070 1,745
Total accrued liabilities $ 15,734 $ 14,282