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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 16, 2017
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Short-term investments - debt securities | $ 30,837,000 | $ 0 |  | $ 30,837,000 |  |
Investment in common stock | 32,538,000 | 90,795,000 |  | 32,538,000 |  |
Investment warrants | 4,110,000 | 13,959,000 |  | 4,110,000 |  |
Other Cost of Operating Revenue | 0 |  | $ 0 | 4,000,000 | $ 0 |
Short-term investments | 66,386,000 |  |  | 66,386,000 |  |
Available-for-sale Securities, Amortized Cost Basis | 30,843,000 |  |  | 30,843,000 |  |
Available-for-sale Debt Securities Gross Unrealized Gain |  |  |  | 0 |  |
Available-for-sale Debt Securities, Gross Unrealized Loss |  |  |  | 6,000 |  |
Available-for-sale Securities, Gross Unrealized Gain |  |  |  | 0 |  |
Available-for-sale Securities, Gross Unrealized Loss |  |  |  | (6,000) |  |
Available-for-sale Securities | 33,848,000 |  |  | 33,848,000 |  |
Investments at fair value | 36,648,000 | 104,754,000 |  | 36,648,000 |  |
Unrealized Gain (Loss) on Investments - Common Stock |  |  |  | (42,278,000) |  |
Unrealized Gain (Loss) on Investment - Warrants |  |  |  | (9,849,000) |  |
Fair Value of Profits Interest | 1,422,000 | 3,041,000 |  | 1,422,000 |  | $ 722,000
Non-cash stock compensation - profits interests | (576,000) |  | 8,181,000 | (1,619,000) | 8,235,000 |
Change in fair value of investment, net | (22,377,000) |  | 158,979,000 | (52,127,000) | 146,281,000 |
Loss on Sale of Investments | $ (5,539,000) |  | $ 0 | (5,539,000) | $ 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements |  |  |  | (10,440,000) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  | (32,538,000) |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |  |
Write-down of deferred tax assets |  | 25,261,000 |  |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis | $ 2,930,000 |  |  | 2,930,000 |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  | 81,000 |  |
Short-term investments - equity securities | 3,011,000 | $ 0 |  | 3,011,000 |  |
Available-for-sale Securities, Amortized Cost Basis | $ 33,773,000 |  |  | $ 33,773,000 |  |
Effective tax rate | (1.00%) |  | 0.00% | 1.00% | (2.00%) |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | $ (32,558,000) |  | $ 158,585,000 | $ (92,699,000) | $ 134,919,000 |
Minimum [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Useful life of patents and patent rights |  |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Useful life of patents and patent rights |  |  |  | 5 years |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  | 50.00% |  |
Geometric Brownian Motion [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Fair Value Assumptions, Expected Term |  |  |  | 4 years |  |
Geometric Brownian Motion [Member] | Minimum [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  | 50.00% |  |
Fair Value Assumptions, Risk Free Interest Rate |  |  |  | 2.00% |  |
Geometric Brownian Motion [Member] | Maximum [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  | 70.00% |  |
Fair Value Assumptions, Risk Free Interest Rate |  |  |  | 3.00% |  |

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