CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (19,950)	$ (13,898)	$ (64,930)	$ (59,504)
Other comprehensive income (loss):
Foreign currency translation adjustment	263	(4,288)	2,833	(3,725)
Deferred income taxes	0	0	0	0
Other comprehensive income (loss), net of tax	263	(4,288)	2,833	(3,725)
Comprehensive loss	$ (19,687)	$ (18,186)	$ (62,097)	$ (63,229)