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Balance Sheet Components (Reserve for Warranty Returns) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 105 $ 329
Benefit (67) (104)
Charge-offs (12) (26)
Balance at end of period $ 26 $ 199