Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (355,928)	$ (285,305)	$ (130,778)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on marketable securities, net	(1,396)	4	26
Total comprehensive loss	$ (357,324)	$ (285,301)	$ (130,752)