CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (103,309)	$ (150,332)	$ (209,722)	$ (585,054)
Other comprehensive income (loss), net of taxes of $0 for all periods:
Foreign currency translation adjustment	255	695	673	(691)
Total comprehensive loss	$ (103,054)	$ (149,637)	$ (209,049)	$ (585,745)