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Balance Sheet Components (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of period $ 301 $ 315
Reductions credited (4) (5)
Accounts written-off, net of recoveries (66) 0
Balance at end of period $ 231 $ 310