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Summary of Significant Accounting Policies (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2018
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 3,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 104,754,000 | $ 0 |  |
Investments at fair value | 104,754,000 | 0 |  |
Short-term investments | $ 0 | $ 19,443,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 2.00% | 1.00% |  |
Fair Value Assumptions, Expected Term | 4 years 135 days | 3 years 22 days |  |
Lag time in recognizing revenues from licensee's quarter | 3 months |  |  |
Fair Value Assumptions, Weighted Average Volatility Rate | 51.00% | 53.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend | $ 0 | $ 0 |  |
Gain on Conversion of Loan and Accrued Interest | 2,671,000 | 0 | $ 0 |
Gain on exercise of Primary Warrant | 4,616,000 | 0 | 0 |
Change in fair value of investment | 42,239,000 | 0 | $ 0 |
Investment at Fair Value Purchases and Issues | $ 55,228,000 |  |  |
Minimum [Member] |  |  |  |
Period after quarter end licensees report activity | 30 days |  |  |
Patents, useful life | 1 year |  |  |
Maximum [Member] |  |  |  |
Period after quarter end licensees report activity | 45 days |  |  |
Patents, useful life | 6 years |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Investments at fair value | $ 0 |  |  |
Short-term investments | 0 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Investments at fair value | 0 |  |  |
Short-term investments | 104,754,000 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Investments at fair value | 19,443,000 |  |  |
Short-term investments | 0 |  |  |
Warrant [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 13,959,000 | 0 |  |
Gain on Conversion of Loan and Accrued Interest | 0 |  |  |
Gain on exercise of Primary Warrant | (4,616,000) |  |  |
Change in fair value of investment | 8,317,000 |  |  |
Investment at Fair Value Purchases and Issues | 1,026,000 |  |  |
Common Stock [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 90,795,000 | $ 0 |  |
Gain on Conversion of Loan and Accrued Interest | 2,671,000 |  |  |
Gain on exercise of Primary Warrant | 0 |  |  |
Change in fair value of investment | 33,922,000 |  |  |
Investment at Fair Value Purchases and Issues | $ 54,202,000 |  |  |

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