Summary of Significant Accounting Policies - Summarized Unaudited Financial Information for the Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Operating expenses	$ 75,723	$ 62,321	$ 159,694	$ 183,293
Operating loss	(23,222)	(17,430)	(63,755)	(104,553)
Other	(22,347)	(20,950)	(43,772)	94,728
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Current assets	70,182		70,182		$ 28,123
Non-current assets	11,059		11,059		1,539
Total assets	81,241		81,241		29,662
Current liabilities	7,633		7,633		6,274
Net assets	73,608		73,608		$ 23,388
Revenues	47	514	329	1,150
Operating expenses	14,383	25,424	32,043	109,493
Operating loss	(14,336)	(24,910)	(31,714)	(108,343)
Other	1,424	4	1,427	3
Net loss	$ (12,912)	$ (24,906)	$ (30,287)	$ (108,340)