CONDENSED CONSOLIDATED STATMENTS 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	$ (13,253)	$ (4,326)	$ (33,407)	$ (13,548)
Other comprehensive income:
Unrealized gain on available-for-sale marketable securities arising during holding period, net of tax benefit of $0	0	0	0	28
Total comprehensive loss	$ (13,253)	$ (4,326)	$ (33,407)	$ (13,520)