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Balance Sheet Account Details - Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Other Balance Sheet Details [Abstract] |  |
Compensation | $ 1,986 | $ 4,045
Legal | 1,135 | 942
Amounts owed to former licensees | 381 | 428
Royalties owed to third parties | 0 | 1,025
Payments due to broker for share repurchases | 0 | 4,613
Return reserve | 3,027 | 3,590
Restructuring | 0 | 1,093
Current operating lease liabilities | 1,242 | 0
Other | 2,065 | 3,464
Accrued liabilities | $ 9,836 | $ 19,200

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