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Balance Sheet Components (Accounts Receivable) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Accounts Receivable, Net [Abstract]        
Accounts receivable, gross $ 4,964 $ 4,949    
Less: allowance for doubtful accounts (231) (301) $ (310) $ (315)
Accounts receivable, net $ 4,733 $ 4,648