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 Comprehensive Income [Abstract]
Net loss	$ (31,261)	$ (21,317)	$ (85,993)	$ (87,074)
Change in unrealized gain (loss) on available-for-sale debt securities	38	(192)	(107)	100
Comprehensive loss	$ (31,223)	$ (21,509)	$ (86,100)	$ (86,974)