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Balance Sheet Components (Property Plant and Equipment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Gross carrying amount $ 25,363 $ 24,416
Less: accumulated depreciation and amortization (20,727) (20,623)
Property and equipment, net $ 4,636 $ 3,793