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Litigation and Asserted Claims (Details) (USD $)
 1 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Hynix Litigation - U.S. District Court of the Northern District of California
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
Sep. 30, 2012
Broadcom, Freescale, LSI, MediaTek, and STMicroelectronics Litigation
Item
Dec. 31, 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
Jan. 29, 2013
Hynix Litigation - Superior Court of California for County of San Francisco
Jan. 29, 2013
Micron Litigation - Superior Court of California for County of San Francisco
Mar. 02, 2007
Stock Option Investigation Related Claims
Aug. 31, 2000
Micron Litigation - U.S. District Court in Delaware: Case No. 00-792-SLR
Patent
Jan. 31, 2013
Subsequent Event
Micron Litigation - U.S. District Court in Delaware: Case No. 00-792-SLR
Loss Contingencies [Line Items]                          
Accrued litigation expenses $ 9,822,000 $ 10,502,000 $ 8,100,000       $ 900,000   $ 350,000 $ 520,000      
Number of patent claims invalid                       8  
Number of patent claims infringed or in suit       14               12  
Number of days for directing judgement by the court                         30 days
Number of appeals         2                
Number of Samsung-related entities added as defendants               3          
Number of shareholders whose actions were filed                     2    
Number of Respondents           1