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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, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued Liabilities |  |
Compensation | $ 3,605 | $ 4,045
Professional fees | 771 | 942
Amounts owed to former licensees | 367 | 428
Royalties owed to third parties | 1,049 | 1,025
Payments due to broker for share repurchases | 0 | 4,613
Return reserve | 3,157 | 3,590
Restructuring | 7 | 1,093
Current operating lease liabilities | 926 | 0
Other | 3,178 | 3,464
Total accrued liabilities | $ 13,060 | $ 19,200

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