Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies (Accrued Liabilities and Other Long-Term Liabilities) (Details)

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Basis of Presentation and Summary of Significant Accounting Policies (Accrued Liabilities and Other Long-Term Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accrued Liabilities    
Compensation $ 1,878 $ 2,603
Professional fees 448 829
Amounts owed to former licensees 853 899
Royalties owed to third parties 908 942
Other 1,238 1,124
Total accrued liabilities $ 5,325 $ 6,397