CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Research and development	$ 5,142	$ 3,807	$ 9,489	$ 7,816
General and administrative	4,279	2,649	7,172	5,381
Total operating expenses	9,421	6,456	16,661	13,197
Loss from operations	(9,421)	(6,456)	(16,661)	(13,197)
Other income	64	33	78	288
Interest income	107	12	120	32
Interest expense	(447)	(651)	(965)	(1,287)
Net loss	$ (9,697)	$ (7,062)	$ (17,428)	$ (14,164)
Net loss per share - basic	$ (0.35)	$ (0.26)	$ (0.64)	$ (0.52)
Net loss per share - diluted	$ (0.35)	$ (0.26)	$ (0.64)	$ (0.52)
Weighted average common shares outstanding - basic	27,378,507	27,355,454	27,373,459	27,346,141
Weighted average common shares outstanding - diluted	27,378,507	27,355,454	27,373,459	27,346,141
Other comprehensive loss:
Unrealized gain (loss) on short-term investments	$ (3)	$ 1	$ (6)	$ (1)
Comprehensive loss	$ (9,700)	$ (7,061)	$ (17,434)	$ (14,165)