CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 4,347	$ 4,009
General and administrative	2,893	2,732
Total operating expenses	7,240	6,741
Loss from operations	(7,240)	(6,741)
Other income	14	255
Interest income	13	20
Interest expense	(518)	(636)
Net loss	$ (7,731)	$ (7,102)
Net loss per share — basic and diluted	$ (0.28)	$ (0.26)
Weighted average common shares outstanding — basic and diluted	27,368,354	27,336,724
Other comprehensive loss:
Unrealized loss on short-term investments	$ (3)	$ (2)
Comprehensive loss	$ (7,734)	$ (7,104)