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)