CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,289)	$ (4,705)
Other comprehensive loss:
Unrealized gain (loss) on investments	(61)	41
Comprehensive loss	$ (3,350)	$ (4,664)