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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 16, 2017
Debt Securities, Trading | $ 33,642,000 |  |  |  | $ 0 |  |  |  | $ 33,642,000 | $ 0 |
Paid Up Revenues |  |  |  |  |  |  |  |  | 100,496,000 | 59,020,000 |
Cumulative Effect of New Accounting Principle in Period of Adoption | 2,814,000 |  |  |  |  |  |  |  | 2,814,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 0 |  |  |  | 104,754,000 |  |  |  | 0 | 104,754,000 |
Trading Securities, Equity | 3,012,000 |  |  |  | 0 |  |  |  | $ 3,012,000 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  |  |  |  | 2.26% | 1.77% |
Fair Value Assumptions, Expected Term |  |  |  |  |  |  |  |  | 4 years 4 months 13 days | 4 years 4 months 13 days |
Fair Value Assumptions, Weighted Average Volatility Rate |  |  |  |  |  |  |  |  | 51.00% | 51.00% |
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 |  |  |  |  |  |  |  |  | 0 | 2,671,000 |
Gain on exercise of Primary Warrant |  |  |  |  |  |  |  |  | 0 | 4,616,000 |
Change in fair value of investment |  |  |  |  |  |  |  |  | (59,103,000) | 42,239,000 |
Realized Investment Gains (Losses) |  |  |  |  |  |  |  |  | (19,095,000) |  |
Proceeds from Sale of Other Investments |  |  |  |  |  |  |  |  | (19,097,000) |  |
Investment at Fair Value Purchases and Issues |  |  |  |  |  |  |  |  | (7,459,000) |  |
Recurring Revenues |  |  |  |  |  |  |  |  | 13,040,000 | 6,382,000 |
Payments for Legal Settlements |  |  |  |  |  |  |  |  | 3,470,000 | 0 |
Sales proceeds |  |  |  |  |  |  |  |  | 14,500,000 | 0 |
Revenues | 49,203,000 | $ 13,725,000 | $ 6,485,000 | $ 62,093,000 | 3,458,000 | $ 36,633,000 | $ 16,457,000 | $ 8,854,000 | 131,506,000 | 65,402,000 |
Investments at fair value | 7,459,000 |  |  |  | 104,754,000 |  |  |  | 7,459,000 | 104,754,000 |
Fair Value of Profits Interest | (591,000) |  |  |  | 3,041,000 |  |  |  | (591,000) | 3,041,000 | $ 722,000
Non-cash stock compensation - profits interest |  |  |  |  |  |  |  |  | $ (2,450,000) |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Patents, useful life |  |  |  |  |  |  |  |  | 5 years |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Trading | 0 |  |  |  |  |  |  |  | $ 0 |  |
Short-term investments | 8,407,000 |  |  |  |  |  |  |  | 8,407,000 |  |
Trading Securities, Equity | 3,012,000 |  |  |  |  |  |  |  | 3,012,000 |  |
Investment warrants | 0 |  |  |  |  |  |  |  | 0 |  |
Investments at fair value - common stock | 5,395,000 |  |  |  |  |  |  |  | 5,395,000 |  |
Fair Value of Profits Interest | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Trading | 33,642,000 |  |  |  |  |  |  |  | 33,642,000 |  |
Short-term investments | 35,706,000 |  |  |  |  |  |  |  | 35,706,000 |  |
Trading Securities, Equity | 0 |  |  |  |  |  |  |  | 0 |  |
Investment warrants | 2,064,000 |  |  |  |  |  |  |  | 2,064,000 |  |
Investments at fair value - common stock | 0 |  |  |  |  |  |  |  | 0 |  |
Investments at fair value |  |  |  |  | 0 |  |  |  |  | 0 |
Fair Value of Profits Interest | 591,000 |  |  |  | 0 |  |  |  | 591,000 | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Trading | 0 |  |  |  |  |  |  |  | 0 |  |
Short-term investments | 0 |  |  |  |  |  |  |  | 0 |  |
Trading Securities, Equity | 0 |  |  |  |  |  |  |  | 0 |  |
Investment warrants | 0 |  |  |  |  |  |  |  | 0 |  |
Investments at fair value - common stock | 0 |  |  |  |  |  |  |  | 0 |  |
Investments at fair value |  |  |  |  | 104,754,000 |  |  |  |  | 104,754,000 |
Fair Value of Profits Interest | 0 |  |  |  | 3,041,000 |  |  |  | 0 | 3,041,000 |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 0 |  |  |  | 13,959,000 |  |  |  | 0 | 13,959,000 |
Change in fair value of investment |  |  |  |  |  |  |  |  | (11,895,000) | 8,317,000 |
Investment at Fair Value Purchases and Issues |  |  |  |  |  |  |  |  | (2,064,000) |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 0 |  |  |  | $ 90,795,000 |  |  |  | 0 | 90,795,000 |
Change in fair value of investment |  |  |  |  |  |  |  |  | (47,208,000) | 33,922,000 |
Realized Investment Gains (Losses) |  |  |  |  |  |  |  |  | (19,095,000) | $ 0 |
Proceeds from Sale of Other Investments |  |  |  |  |  |  |  |  | (19,097,000) |  |
Investment at Fair Value Purchases and Issues |  |  |  |  |  |  |  |  | $ (5,395,000) |  |

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