Unaudited Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (19,969)	$ (31,868)	$ (449,636)	$ (56,256)
Other comprehensive income (loss):
Currency translation adjustments	3,357	(5,672)	(12,664)	(5,535)
Comprehensive loss	$ (16,612)	$ (37,540)	$ (462,300)	$ (61,791)