CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (20,296)	$ (17,004)	$ (44,980)	$ (45,606)
Other comprehensive income:
Foreign currency translation adjustment	1,127	965	2,570	563
Deferred income taxes	0	0	0	0
Other comprehensive income, net of tax	1,127	965	2,570	563
Comprehensive loss	$ (19,169)	$ (16,039)	$ (42,410)	$ (45,043)