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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Feb. 16, 2017
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Investment in common stock | $ 65,827,000 | $ 90,795,000 |  | $ 65,827,000 |  |
Investment warrants | 9,177,000 | 13,959,000 |  | 9,177,000 |  |
Other Cost of Operating Revenue | 0 |  | $ 0 | 4,000,000 | $ 0 |
Short-term investments | 34,694,000 | 0 |  | 34,694,000 |  |
Available-for-sale Securities, Amortized Cost Basis | 34,704,000 |  |  | 34,704,000 |  |
Available-for-sale Securities, Gross Unrealized Gain |  |  |  | 1,000 |  |
Available-for-sale Securities, Gross Unrealized Loss |  |  |  | (11,000) |  |
Available-for-sale Securities | 34,694,000 |  |  | 34,694,000 |  |
Investments at fair value | 75,004,000 | 104,754,000 |  | 75,004,000 |  |
Unrealized Gain (Loss) on Investments - Common Stock | (24,968,000) |  |  |  |  |
Unrealized Gain (Loss) on Investment - Warrants | (4,782,000) |  |  |  |  |
Fair Value of Profits Interest | 1,998,000 |  |  | 1,998,000 |  | $ 722,000
Change in fair value of investment, net | $ 11,347,000 |  | $ (12,698,000) | $ (29,750,000) | $ (12,698,000) |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |  |
Write-down of deferred tax assets |  | $ 25,261,000 |  |  |  |
Effective tax rate | (1.00%) |  | (12.00%) | 1.00% | 11.00% |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | $ (28,221,000) |  | $ (12,786,000) | $ (60,141,000) | $ (23,666,000) |
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 |  |  |  | 6 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 |  |  |  | 3 years 11 months |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  | 60.00% |  |
Geometric Brownian Motion [Member] | Minimum [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
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 Term |  |  |  | 10 years |  |
Fair Value Assumptions, Risk Free Interest Rate |  |  |  | 3.00% |  |

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