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Balance Sheet Components (Components Of Prepaid Expenses And Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Components [Abstract]    
Receivable from Prior Landlord   $ 5,000
Rent deposits for O'Brien building   2,160
Prepaid expenses $ 1,318 2,342
Other current assets 931 476
Prepaid expenses and other current assets $ 2,249 $ 9,978