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Balance Sheet Components (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of period $ 32 $ 60
Additions charged (reductions credited) 25 (21)
Balance at end of period $ 57 $ 39