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Basis of Presentation and Summary of Significant Accounting Policies (Accrued Liabilities and Other Long-Term Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accrued Liabilities    
Compensation $ 2,479 $ 2,603
Professional fees 634 829
Amounts owed to former licensees 457 899
Royalties owed to third parties 1,000 942
Deferred revenue 1,075 0
Other 778 1,124
Total accrued liabilities $ 6,423 $ 6,397