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Agreements with SK hynix and Micron (Details 2)
$ in Thousands
 3 Months Ended 9 Months Ended 22 Months Ended 28 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
SK hynix [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2015 $ 16,000 $ 40,000   $ 112,000
Estimated to Be Received in Remainder of 2015 16,000 16,000 $ 16,000 16,000
Estimated to Be Received in 2016 64,000 64,000 64,000 64,000
Estimated to Be Received in 2017 48,000 48,000 48,000 48,000
Estimated to Be Received in 2018 40,000 40,000 40,000 40,000
Estimated to Be Received in 2019 32,000 32,000 32,000 32,000
Estimated to Be Received in 2020 216,000 216,000 216,000 216,000
Total Estimated Cash receipts 528,000 528,000 528,000 528,000
SK hynix [Member] | Royalty revenue        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2015 15,800 39,500   110,400
Estimated to Be Received in Remainder of 2015 15,800 15,800 15,800 15,800
Estimated to Be Received in 2016 63,900 63,900 63,900 63,900
Estimated to Be Received in 2017 48,000 48,000 48,000 48,000
Estimated to Be Received in 2018 40,000 40,000 40,000 40,000
Estimated to Be Received in 2019 32,000 32,000 32,000 32,000
Estimated to Be Received in 2020 216,000 216,000 216,000 216,000
Total Estimated Cash receipts 526,100 526,100 526,100 526,100
SK hynix [Member] | Gain from settlement        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2015 200 500   1,600
Estimated to Be Received in Remainder of 2015 200 200 200 200
Estimated to Be Received in 2016 100 100 100 100
Estimated to Be Received in 2017 0 0 0 0
Estimated to Be Received in 2018 0 0 0 0
Estimated to Be Received in 2019 0 0 0 0
Estimated to Be Received in 2020 0 0 0 0
Total Estimated Cash receipts 1,900 1,900 1,900 1,900
Micron [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2015 10,000 30,000 75,500  
Estimated to Be Received in Remainder of 2015 10,000 10,000 10,000 10,000
Estimated to Be Received in 2016 40,000 40,000 40,000 40,000
Estimated to Be Received in 2017 40,000 40,000 40,000 40,000
Estimated to Be Received in 2018 40,000 40,000 40,000 40,000
Estimated to Be Received in 2019 40,000 40,000 40,000 40,000
Estimated to Be Received in 2020 34,500 34,500 34,500 34,500
Total Estimated Cash receipts 280,000 280,000 280,000 280,000
Micron [Member] | Royalty revenue        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2015 9,700 29,000 73,000  
Estimated to Be Received in Remainder of 2015 9,700 9,700 9,700 9,700
Estimated to Be Received in 2016 39,500 39,500 39,500 39,500
Estimated to Be Received in 2017 40,000 40,000 40,000 40,000
Estimated to Be Received in 2018 40,000 40,000 40,000 40,000
Estimated to Be Received in 2019 40,000 40,000 40,000 40,000
Estimated to Be Received in 2020 34,500 34,500 34,500 34,500
Total Estimated Cash receipts 276,700 276,700 276,700 276,700
Micron [Member] | Gain from settlement        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2015 300 1,000 2,500  
Estimated to Be Received in Remainder of 2015 300 300 300 300
Estimated to Be Received in 2016 500 500 500 500
Estimated to Be Received in 2017 0 0 0 0
Estimated to Be Received in 2018 0 0 0 0
Estimated to Be Received in 2019 0 0 0 0
Estimated to Be Received in 2020 0 0 0 0
Total Estimated Cash receipts $ 3,300 $ 3,300 $ 3,300 $ 3,300