CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (368,198)	$ (523,837)	$ (444,440)
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale investments	(1,114)	(1,568)	(927)
Net foreign currency translation gain (loss)	(1,636)	(294)	(363)
Other comprehensive income (loss)	(2,750)	(1,862)	(1,290)
Comprehensive loss	$ (370,948)	$ (525,699)	$ (445,730)