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Agreements with SK hynix and Micron (Details 2) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Total
Total
Total
SK hynix [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2015 $ 12,000 $ 24,000   $ 96,000
Estimated to Be Received in Remainder of 2015 32,000 32,000 $ 32,000 32,000
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 11,800 23,600   94,600
Estimated to Be Received in Remainder of 2015 31,600 31,600 31,600 31,600
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 200 400   1,400
Estimated to Be Received in Remainder of 2015 400 400 400 400
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 20,000 65,500  
Estimated to Be Received in Remainder of 2015 20,000 20,000 20,000 20,000
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 19,400 63,400  
Estimated to Be Received in Remainder of 2015 19,300 19,300 19,300 19,300
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 300 600 2,100  
Estimated to Be Received in Remainder of 2015 700 700 700 700
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