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Settlement Agreement with Samsung (Details 2) (USD $)
 3 Months Ended 12 Months Ended 15 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2011
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
Memorandum of Understanding               0
Residual value               48,000,000
Consideration recognized               900,000,000
Estimated Fair Value                
Consideration recognized               900,000,000
Revenue               575,000,000
Gain from settlement               133,000,000
Purchase of Rambus Common Stock               192,000,000
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 87,800,000 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       87,800,000 93,200,000 181,200,000    
Gain from settlement       0 6,200,000 126,800,000 133,000,000  
Purchase of Rambus common stock       0 0 192,000,000    
Total       87,800,000 99,400,000 500,000,000    
Remaining amount of 2010 settlement consideration after common stock allocation           308,000,000    
Remaining balance to be received       200,000,000        
Approximate proceeds under License Agreement (per quarter), due to Settlement Agreement with Samsung       $ 25,000,000