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Balance Sheet Components (Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
BALANCE SHEET COMPONENTS [Abstract]        
Reclassification of unrealized gain upon sale of available-for-sale securities $ 0 $ 0 $ 0 $ 255