CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating expenses:
Research and development	$ 3,030	$ 6,065	$ 9,853	$ 11,754
General and administrative	1,773	2,196	6,035	6,376
Total operating expenses	4,803	8,261	15,888	18,130
Loss from operations	(4,803)	(8,261)	(15,888)	(18,130)
Change in fair value of common stock warrant liability	167	319	600	(768)
Interest and other income, net	2	9	4	50
Pre-tax loss	(4,634)	(7,933)	(15,284)	(18,848)
Income tax benefit			1,800	2,125
Net loss	$ (4,634)	$ (7,933)	$ (13,484)	$ (16,723)
Weighted average shares outstanding:
Basic (in shares)	9,506,419	9,491,111	9,501,428	7,228,349
Diluted (in shares)	9,506,419	9,491,111	9,501,428	7,228,349
Net loss per share:
Basic (in dollars per share)	$ (0.49)	$ (0.84)	$ (1.42)	$ (2.31)
Diluted (in dollars per share)	$ (0.49)	$ (0.84)	$ (1.42)	$ (2.31)