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Balance Sheet Components (Reserve for Warranty Returns) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 439 $ 723
Provision (benefit) 485 (139)
Charge-offs (419) (194)
Balance at end of period $ 505 $ 390