CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (100,748)	$ (1,159,501)	$ (241,944)	$ (1,200,921)
Other comprehensive income (loss), net of taxes:
Change in unrealized gain (loss) on available-for-sale marketable securities	5,941	745	3,406	1,934
Change in foreign currency translation adjustment	3	9	(316)	10
Comprehensive loss	$ (94,804)	$ (1,158,747)	$ (238,854)	$ (1,198,977)