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Litigation and Asserted Claims (Details) (USD $)
 1 Months Ended 15 Months Ended 37 Months Ended 65 Months Ended 102 Months Ended 146 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2012
Hynix Litigation - U.S. District Court of the Northern District of California
Apr. 30, 2006
Hynix Litigation - U.S. District Court of the Northern District of California
Dec. 31, 2005
Hynix Litigation - U.S. District Court of the Northern District of California
Apr. 30, 2010
Hynix Litigation - U.S. District Court of the Northern District of California
Jan. 31, 2009
Hynix Litigation - U.S. District Court of the Northern District of California
Dec. 31, 2005
Hynix Litigation - U.S. District Court of the Northern District of California
Jan. 31, 2009
Hynix Litigation - U.S. District Court of the Northern District of California
Sep. 30, 2012
Hynix Litigation - U.S. District Court of the Northern District of California
Item
Jun. 29, 2012
Hynix Litigation - Superior Court of California for County of San Francisco
Feb. 15, 2012
Hynix Litigation - Superior Court of California for County of San Francisco
Jan. 31, 2009
Micron Litigation - U.S. District Court in Delaware: Case No. 00-792-SLR
Patent
Aug. 31, 2000
Micron Litigation - U.S. District Court in Delaware: Case No. 00-792-SLR
Patent
Nov. 30, 2008
Micron Litigation - U.S. District Court of the Northern District of California
Patent
Sep. 30, 2008
Micron Litigation - U.S. District Court of the Northern District of California
Item
Jan. 31, 2006
Micron Litigation - U.S. District Court of the Northern District of California
Patent
Sep. 30, 2012
Micron Litigation - European Patent Infringement Cases
Jun. 29, 2012
Micron Litigation - Superior Court of California for County of San Francisco
Feb. 15, 2012
Micron Litigation - Superior Court of California for County of San Francisco
Nov. 30, 2008
DDR2, DDR3, gDDR2, GDDR3, GDDR4 Litigation ("DDR2") - U.S. District Court in the Northern District of California
Patent
Sep. 04, 2008
DDR2, DDR3, gDDR2, GDDR3, GDDR4 Litigation ("DDR2") - U.S. District Court in the Northern District of California
Apr. 30, 2010
European Commission Competition Directorate-General
Dec. 31, 2009
European Commission Competition Directorate-General
Dec. 31, 2011
European Commission Competition Directorate-General
Sep. 30, 2012
Broadcom, Freescale, LSI, MediaTek, and STMicroelectronics Litigation
Item
Sep. 30, 2012
Superior Court of California for the County of San Francisco
May 05, 2004
Superior Court of California for the County of San Francisco
Item
Mar. 02, 2007
Stock Option Investigation Related Claims
Loss Contingencies                                                      
Number of phases in a case               3                                      
Damages awarded by court   $ 307,000,000 $ 134,000,000   $ 215,000,000 $ 134,000,000 $ 397,000,000                                        
Pre-judgment interest             48,000,000                                        
Litigation costs to be awarded             760,000                                        
Maximum royalty rate of percentage for SDR SDRAM       1.00%                                              
Maximum royalty rate of percentage for DDR SDRAM       4.25%                                   1.50%          
Litigation Settlement, Amount to be paid 8,100,000                                                    
Number of patent claims invalid                       8                              
Number of patent claims infringed or in suit                     12 12 16 12 14       16                
Number of appeals                               2                      
Number of patent claims elected to proceed to trial                                       12              
Term of license agreement (in years)                                           5 years          
Royalty rate of percentage for SDR                                         1.50%            
Reduced royalty rate of percentage for SDR                                             1.00%        
Royalty rate of percentage for DDR, DDR2, DDR3, GDDR4                                         2.65%            
Reduced royalty rate of percentage for DDR, DDR2, DDR3, GDDR4                                             2.00%        
Number of Samsung-related entities added as defendants                                                   3  
Costs which the plaintiff seeks to recover                 350,000 3,000,000             520,000 1,600,000                  
Accrued litigation expenses                                                 $ 900,000    
Number of shareholders whose actions were filed                                                     2
Number of respondents                                               1