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Agreements with SK hynix and Micron (Details 2)
$ in Thousands
 3 Months Ended 28 Months Ended 34 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
SK hynix [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash Received to date in 2016 $ 16,000   $ 144,000
Estimated to Be Received in Remainder of 2016 48,000 $ 48,000 48,000
Estimated to Be Received in 2017 48,000 48,000 48,000
Estimated to Be Received in 2018 40,000 40,000 40,000
Estimated to Be Received in 2019 32,000 32,000 32,000
Estimated to Be Received in 2020 48,000 48,000 48,000
Estimated to Be Received in 2021 and thereafter 168,000 168,000 168,000
Total Estimated Cash receipts 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 15,900   142,100
Estimated to Be Received in Remainder of 2016 48,000 48,000 48,000
Estimated to Be Received in 2017 48,000 48,000 48,000
Estimated to Be Received in 2018 40,000 40,000 40,000
Estimated to Be Received in 2019 32,000 32,000 32,000
Estimated to Be Received in 2020 48,000 48,000 48,000
Estimated to Be Received in 2021 and thereafter 168,000 168,000 168,000
Total Estimated Cash receipts 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
Estimated to Be Received in 2017 0 0 0
Estimated to Be Received in 2018 0 0 0
Estimated to Be Received in 2019 0 0 0
Estimated to Be Received in 2020 0 0 0
Estimated to Be Received in 2021 and thereafter 0 0 0
Total Estimated Cash receipts 1,900 1,900 1,900
Micron [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash Received to date in 2016 10,000 95,500  
Estimated to Be Received in Remainder of 2016 30,000 30,000 30,000
Estimated to Be Received in 2017 40,000 40,000 40,000
Estimated to Be Received in 2018 40,000 40,000 40,000
Estimated to Be Received in 2019 40,000 40,000 40,000
Estimated to Be Received in 2020 34,500 34,500 34,500
Total Estimated Cash receipts 280,000 280,000 280,000
Micron [Member] | Royalty revenue      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash Received to date in 2016 9,700 92,300  
Estimated to Be Received in Remainder of 2016 29,900 29,900 29,900
Estimated to Be Received in 2017 40,000 40,000 40,000
Estimated to Be Received in 2018 40,000 40,000 40,000
Estimated to Be Received in 2019 40,000 40,000 40,000
Estimated to Be Received in 2020 34,500 34,500 34,500
Total Estimated Cash receipts 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 300 3,200  
Estimated to Be Received in Remainder of 2016 100 100 100
Estimated to Be Received in 2017 0 0 0
Estimated to Be Received in 2018 0 0 0
Estimated to Be Received in 2019 0 0 0
Estimated to Be Received in 2020 0 0 0
Total Estimated Cash receipts $ 3,300 $ 3,300 $ 3,300