CONDENSED CONSOLIDATED STATEMENTS OF AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	ACCUMULATED DEFICIT
Beginning balance at Dec. 31, 2020	$ 84,435	$ 18	$ 180,526	$ 4	$ (96,113)
Beginning balance, shares at Dec. 31, 2020		17,548,263
Stock-based compensation expense	947		947
Exercise of stock options	472		472
Exercise of stock options, shares		68,279
Unrealized loss on investments	(3)			(3)
Net loss	(10,257)				(10,257)
Ending balance at Mar. 31, 2021	75,594	$ 18	181,945	1	(106,370)
Ending balance at Mar. 31, 2021		17,616,542
Beginning balance at Dec. 31, 2021	86,030	$ 27	233,516	(16)	(147,497)
Beginning balance, shares at Dec. 31, 2021		26,287,264
Stock-based compensation expense	1,056		1,056
Unrealized loss on investments	(35)			(35)
Net loss	(14,639)				(14,639)
Ending balance at Mar. 31, 2022	$ 72,412	$ 27	$ 234,572	$ (51)	$ (162,136)
Ending balance at Mar. 31, 2022		26,287,264