Business Overview (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	May 06, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net cash (used in) operating activities				$ (60,127)	$ (49,035)
Cash and cash equivalents		$ 141,219	$ 61,695	141,219	61,695	$ 61,653	$ 146,470
Income (Loss) from operations		(36,860)	$ (26,919)	(64,410)	(49,723)
Working Capital		$ 122,400		122,400
Subsidiary, Sale of Stock [Line Items]
Net proceeds from private placement				$ 89,845	$ 14,672
Private Placement
Subsidiary, Sale of Stock [Line Items]
Shares sold in private placement (in shares)	29,948,334
Shares issued (in dollars per share)	$ 3.00
Net proceeds from private placement	$ 89,800