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Balance Sheet Components (Schedule Of Accrued Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Components [Abstract]    
Salaries and benefits $ 7,570 $ 8,562
Accrued product development costs 2,034 5,411
Inventory accrual, professional services, accrued interest and other 3,014 2,631
Accrued expenses $ 12,618 $ 16,604