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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Feb. 16, 2017
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Investment in common stock | $ 57,345,000 | $ 90,795,000 |  |
Investment warrants | 6,312,000 | 13,959,000 |  |
Other Cost of Operating Revenue | 4,000,000 |  | $ 0 |
Short-term investments | 29,359,000 | 0 |  |
Available-for-sale Securities, Amortized Cost Basis | 29,378,000 |  |  |
Available-for-sale Securities, Gross Unrealized Gain | 0 |  |  |
Available-for-sale Securities, Gross Unrealized Loss | (19,000) |  |  |
Available-for-sale Securities | 29,359,000 |  |  |
Investments at fair value | 63,657,000 | 104,754,000 |  |
Unrealized Gain (Loss) on Investments - Common Stock | (33,450,000) |  |  |
Unrealized Gain (Loss) on Investment - Warrants | (7,647,000) |  |  |
Fair Value of Profits Interest | 1,313,000 |  |  | $ 722,000
Change in fair value of investment, net | $ (41,097,000) |  | $ 0 |
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%) |  | (11.00%) |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | $ (31,920,000) |  | $ (10,880,000) |
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 | 4 years 5 months |  |  |
Fair Value Assumptions, Expected Volatility Rate | 50.00% |  |  |
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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