Business (Details) - USD ($) $ in Thousands	9 Months Ended		57 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net cash used for operating activities since January 2012	$ (40,098)	$ (16,702)	$ (85,000)
Cash and cash equivalents	$ 85,035	$ 135,055	$ 85,035	$ 126,467	$ 48,555