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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Short-term investments - debt securities | $ 93,756,000 |  |  | $ 33,642,000
Investment in common stock | 4,116,000 |  |  | 5,395,000
Investment warrants | 1,367,000 |  |  | 2,064,000
Patent acquisition expenses | 0 | $ 4,000,000 |  |
Available-for-sale Securities, Amortized Cost Basis | 93,464,000 |  |  | 33,643,000
Debt Securities, Available-for-sale, Unrealized Gain | 294,000 |  |  | 18,000
Debt Securities, Available-for-sale, Unrealized Loss | (2,000) |  |  | (19,000)
Available-for-sale Securities, Gross Unrealized Gain | 302,000 |  |  | 45,000
Available-for-sale Securities, Gross Unrealized Loss | (8,000) |  |  | (423,000)
Available-for-sale Securities | 94,587,000 |  |  | 36,654,000
Investments at fair value | 5,483,000 |  |  | 7,459,000
Unrealized Gain (Loss) on Investments - Common Stock | 7,605,000 | (33,450,000) |  |
Unrealized Gain (Loss) on Investment - Warrants | (697,000) | (7,647,000) |  |
Fair Value of Profits Interest | 591,000 |  |  | 591,000
Non-cash stock compensation - profits interests | 0 | (1,728,000) |  |
Change in fair value of investment, net | 6,908,000 | (41,097,000) |  |
Loss on Sale of Investments | (5,590,000) | $ 0 |  | (19,100,000)
Available-for-sale Equity Securities, Amortized Cost Basis | 829,000 |  |  | 3,389,000
Trading Securities, Unrealized Holding Gain | 8,000 |  |  | 27,000
Available-for-sale Equity Securities, Gross Unrealized Loss |  |  | $ (6,000) | (404,000)
Short-term investments - equity securities | 831,000 |  |  | 3,012,000
Available-for-sale Securities, Amortized Cost Basis | $ 94,293,000 |  |  | 37,032,000
Effective tax rate | (8.00%) | 1.00% |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | $ (4,084,000) | $ (31,920,000) |  |
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, Inputs, Level 1 [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Short-term investments | $ 4,947,000 |  |  | 8,407,000
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Short-term investments | $ 95,123,000 |  |  | $ 35,706,000

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