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Basis of Presentation and Summary of Significant Accounting Policies - Accrued Liabilities and Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued Liabilities |  |
Compensation | $ 2,321 | $ 1,986
Professional fees | 690 | 1,135
Amounts owed to former licensees | 383 | 381
Royalties owed to third parties | 1,062 | 0
Return reserve | 2,899 | 3,027
Current operating lease liabilities | 1,483 | 1,242
Accrued interest | 1,437 | 690
Other | 1,573 | 1,375
Total accrued liabilities | $ 11,848 | $ 9,836

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