Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,602,241)	$ (911,335)	$ (688,301)
Other comprehensive income (loss)
Foreign currency translation adjustment	162	988	0
Unrealized gain (loss) on marketable securities, net of taxes	2,430	156	(918)
Other comprehensive income (loss)	2,592	1,144	(918)
Comprehensive loss	$ (2,599,649)	$ (910,191)	$ (689,219)