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%