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Settlement Agreement with Samsung (Details) (USD $)
 1 Months Ended 3 Months Ended
Aug. 31, 2011
Mar. 31, 2011
installment
Mar. 31, 2010
Dec. 31, 2012
Jul. 20, 2011
Jan. 19, 2010
Settlement Agreement with Samsung            
Number of installments for litigation settlement proceeds, due to settlement agreement with Samsung   2        
Litigation settlement payment amount for each installment payment   $ 200,000,000        
Quarterly License fee agreed to be paid by Samsung           25,000,000
Period of non-exclusive rights to certain patents (in years)           5 years
Issuance of common stock due to the settlement with Samsung (in shares)   9,600,000 9,600,000      
Amount expected to be paid by Samsung           900,000,000
Number of years over which Samsung is required to make payment (in years)           5 years
Fixed amount to be received quarterly from Samsung during 2010 and the first two quarters of 2011           25,000,000
Base amount to be received quarterly from Samsung and to be adjusted up or down from the third quarter of 2011 to the fourth quarter of 2014           25,000,000
Minimum adjusted amount to be received quarterly from Samsung from the third quarter of 2011           10,000,000
Maximum adjusted amount to be received quarterly from Samsung from the third quarter of 2011           40,000,000
Original Issue price of shares under stock purchase agreement with Samsung (in dollars per share)           $ 20.885
Settlement agreement shares as a percentage of total shares           8.30%
Period after the date of Stock Purchase Agreement (in months)           18 months
Extended period after the date of Stock Purchase Agreement (in months)           19 months
Maximum number of shares elected to be put back by the Samsung           4,800,000
Maximum aggregate purchase price           100,000,000
Actual number of shares put back due to the settlement agreement with Samsung         4,800,000  
Actual value of shares put back         100,000,000  
Amount paid for actual value of shares put back 100,000,000          
Prohibited period for transfer of shares by Samsung (in months)           18 months
Prohibited period to acquire additional shares by Samsung ( in months)           18 months
Minimum percentage of shares to be held by Samsung to prevent termination of voting agreement           3.00%
Remaining balance to be received       200,000,000    
Approximate proceeds under License Agreement (per quarter), due to Settlement Agreement with Samsung       $ 25,000,000