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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, 2018
Dec. 31, 2017
Accrued Liabilities    
Compensation $ 3,166 $ 4,085
Professional fees 367 430
Amounts owed to former licensees 468 396
Royalties owed to third parties 2,245 954
Other 3,066 1,512
Total accrued liabilities $ 9,312 $ 7,377