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Balance Sheet Account Details - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
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