CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (322,431)	$ (197,310)	$ (897,467)	$ (240,695)
Other comprehensive income (loss):
Net unrealized losses on marketable securities available-for-sale, net of reclassifications	0	(26)	(9)	18
Foreign currency translation adjustment	(3,309)	8,226	(6,154)	7,495
Other comprehensive income (loss)	(3,309)	8,200	(6,163)	7,513
Comprehensive loss	$ (325,740)	$ (189,110)	$ (903,630)	$ (233,182)