CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (24,822)	$ (20,296)	$ (57,266)	$ (44,980)
Other comprehensive income:
Foreign currency translation adjustment	(1,027)	1,127	677	2,570
Deferred income taxes	0	0	0	0
Other comprehensive income, net of tax	(1,027)	1,127	677	2,570
Comprehensive loss	$ (25,849)	$ (19,169)	$ (56,589)	$ (42,410)