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Balance Sheet Components (Reserve for Warranty Returns) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 105 $ 329
Benefit (65) (53)
Charge-offs (8) (22)
Balance at end of period $ 32 $ 254