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
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (197,310)	$ (18,043)	$ (240,695)	$ (100,864)
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities available-for-sale	(26)		18	5
Foreign currency translation adjustment	8,226	(1,564)	7,495	(2,668)
Other comprehensive income (loss)	8,200	(1,564)	7,513	(2,663)
Comprehensive loss	$ (189,110)	$ (19,607)	$ (233,182)	$ (103,527)