Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (83,263)	$ (51,452)	$ (245,197)	$ (172,135)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on marketable securities, net	(95)	32	(112)	29
Total comprehensive loss	$ (83,358)	$ (51,420)	$ (245,309)	$ (172,106)