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Agreements with SK hynix and Micron (Details 2)
$ in Thousands
 3 Months Ended 9 Months Ended 34 Months Ended 40 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
SK hynix [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash Received to date in 2016 $ 16,000 $ 48,000   $ 176,000
Estimated to Be Received in Remainder of 2016 16,000 16,000 $ 16,000 16,000
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 48,000 48,000 48,000 48,000
Estimated to Be Received in 2021 and thereafter 168,000 168,000 168,000 168,000
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 2016 16,000 47,900   174,100
Estimated to Be Received in Remainder of 2016 16,000 16,000 16,000 16,000
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 48,000 48,000 48,000 48,000
Estimated to Be Received in 2021 and thereafter 168,000 168,000 168,000 168,000
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 2016   100   1,900
Estimated to Be Received in Remainder of 2016 0 0 0 0
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
Estimated to Be Received in 2021 and thereafter 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 2016 10,000 30,000 115,500  
Estimated to Be Received in Remainder of 2016 10,000 10,000 10,000 10,000
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 2016 10,000 29,600 112,200  
Estimated to Be Received in Remainder of 2016 10,000 10,000 10,000 10,000
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 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 2016 0 400 3,300  
Estimated to Be Received in Remainder of 2016 0 0 0 0
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