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Balance Sheet Components (Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Accounts Receivable, Net [Abstract]        
Accounts receivable, gross $ 4,124 $ 4,918    
Less: allowance for doubtful accounts (368) (361) (393) (399)
Accounts receivable, net $ 3,756 $ 4,557