Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (105,538)	$ (32,128)	$ (55,744)
Other comprehensive (loss) income:
Unrealized (loss) gain on available-for-sale securities	(443)	(36)	212
Comprehensive loss	$ (105,981)	$ (32,164)	$ (55,532)