Summary of Significant Accounting Policies - Summarized Unaudited Financial Information for the Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Operating expenses	$ 77,806	$ 61,283	$ 237,500	$ 244,576
Operating loss	(28,821)	(7,916)	(92,576)	(112,469)
Other	4,647	(29,607)	(39,125)	65,121
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Current assets	81,049		81,049		$ 28,123
Non-current assets	10,992		10,992		1,539
Total assets	92,041		92,041		29,662
Current liabilities	8,325		8,325		6,274
Net assets	83,716		83,716		$ 23,388
Revenues	65	330	394	1,480
Operating expenses	18,363	8,687	50,406	118,180
Operating loss	(18,298)	(8,357)	(50,012)	(116,700)
Other	75	(34)	1,502	(31)
Net loss	$ (18,223)	$ (8,391)	$ (48,510)	$ (116,731)