CONSOLIDATED 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	$ (46,677)	$ (42,731)	$ (99,013)
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on available-for-sale securities	(316)	(40)	50
Other comprehensive (loss) income	(316)	(40)	50
Comprehensive loss	$ (46,993)	$ (42,771)	$ (98,963)