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Basis of Presentation and Significant Accounting Policies (Accrued Liabilities and Other Long-Term Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accrued Liabilities    
Compensation $ 2,150 $ 1,711
Professional fees 640 726
Amounts owed to former licensees 980 915
Royalties owed to third parties 1,028 823
Other 1,877 1,222
Total accrued liabilities $ 6,675 $ 5,397