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Balance Sheet Components (Property Plant and Equipment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]    
Gross carrying amount $ 29,853 $ 27,573
Less: accumulated depreciation and amortization (22,823) (21,171)
Property and equipment, net $ 7,030 $ 6,402