Income Taxes - Schedule of Income (Loss) Before Income Taxes Attributed to Geographic Locations (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
United States					$ (10,421)	$ (17,671)	$ (49,850)
Foreign					(85,149)	(64,506)	(7,663)
Net loss before provision for income taxes	$ (21,885)	$ (27,335)	$ (22,118)	$ (24,232)	$ (95,570)	$ (82,177)	$ (57,513)