Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (108,327)	$ (126,710)
Other comprehensive (loss) income:
Foreign currency translation	(2,162)	1,215
Other comprehensive (loss) income	(2,162)	1,215
Comprehensive loss	$ (110,489)	$ (125,495)