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Segment Information (Revenue by Major Customer) (Details) (Sales Revenue, Net)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
All Distributors
       
Revenue, Major Customer        
Percentage of revenue 78.00% 75.00% 71.00% 69.00%
Distributor A
       
Revenue, Major Customer        
Percentage of revenue 52.00% 58.00% 50.00% 52.00%
Top five end customers
       
Revenue, Major Customer        
Percentage of revenue 56.00% [1] 55.00% [1] 54.00% [1] 55.00% [1]
End customer A
       
Revenue, Major Customer        
Percentage of revenue 19.00% [1] 15.00% [1] 17.00% [1] 13.00% [1]
End customer B
       
Revenue, Major Customer        
Percentage of revenue 17.00% [1] 16.00% [1] 14.00% [1] 13.00% [1]
End customer C
       
Revenue, Major Customer        
Percentage of revenue 5.00% [1] 11.00% [1] 5.00% [1] 15.00% [1]
[1] End customers include customers who purchase directly from us, as well as customers who purchase our products indirectly through distributors.