CONDENSED 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 income (loss)	$ (94,220)	$ (124,732)	$ (336,164)	$ (1,325,653)
Other comprehensive income (loss), net of taxes:
Change in unrealized gain (loss) on available-for-sale marketable securities	(1,772)	0	1,634	1,934
Change in foreign currency translation adjustment	98	(147)	(218)	(137)
Comprehensive loss	$ (95,894)	$ (124,879)	$ (334,748)	$ (1,323,856)