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Balance Sheet Components (Components Of Prepaid Expenses And Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Balance Sheet Components [Abstract]    
Receivable from Prior Landlord $ 755 $ 5,000
Rent deposits for O'Brien building 1,080 2,160
Prepaid expenses 1,140 2,342
Other current assets 570 476
Prepaid expenses and other current assets $ 3,545 $ 9,978