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Basis of Presentation (Accrued Liabilities and Other Long-Term Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accrued Liabilities    
Compensation $ 1,485 $ 1,708
Professional fees 443 459
Amounts owed to former licensees 956 925
Royalties owed to third parties 798 705
Other 474 1,069
Total accrued liabilities 4,156 4,866
Other Long-Term Liabilities    
Deposits 319 411
Deferred rent 291 327
Other 33 32
Total other long-term liabilities $ 643 $ 770