Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 24, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 1,480	$ 1,480	$ 5,941
Available-for-sale securities sold	6,000
Realized gain (loss) on available-for-sale securities sold	0	0
Nicox [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,500	1,500
Unrealized gain (loss) on securities		1,700
Original cost basis					$ 10,800
Available-for-sale securities sold		6,000	$ 2,600	$ 600
Unrealized gain (loss) on investment	(100)
Initial Value [Member] | Nicox [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 12,500	$ 12,500
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible asset useful life (in years)		1 year
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible asset useful life (in years)		30 years