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Settlement Agreement with Samsung (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Jan. 19, 2010
Settlement Agreement                
Antitrust litigation settlement               $ 85,000,000
Settlement of past infringement               190,000,000
License Agreement               385,000,000
Stock Purchase Agreement               192,000,000
Residual value               48,000,000
Total               900,000,000
Estimated Fair Value                
Revenue               575,000,000
Gain from settlement               133,000,000
Purchase of Rambus Common Stock               192,000,000
Total               900,000,000
Amount of shares with which contractual put rights are associated               113,500,000
Amount of restricted common stock issued to Samsung               78,500,000
Litigation settlement payments by Samsung   25,000,000 25,000,000 25,000,000   99,400,000 500,000,000  
Amount allocated to contingently redeemable common stock             113,500,000  
Amount allocated to stockholder's equity             78,500,000  
Current Cash Receipts                
Revenue           93,200,000 181,200,000  
Gain from settlement 6,200,000 10,300,000 10,300,000 10,300,000 95,900,000 6,200,000 126,800,000  
Purchase of Rambus Common Stock             192,000,000  
Remaining balance to be received           300,000,000    
Remaining amount of 2010 settlement consideration after common stock allocation             308,000,000  
Approximate proceeds under License Agreement (per quarter), due to Settlement Agreement with Samsung           25,000,000    
Total           $ 99,400,000 $ 500,000,000