CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 3,679	$ 3,320
General and administrative	2,890	2,478
Total operating expenses	6,569	5,798
Loss from operations	(6,569)	(5,798)
Other income (expense):
Interest and other income	6	1
Interest and other expense	(155)	(216)
Loss before income taxes	(6,718)	(6,013)
Income tax expense	(1)	0
Net loss and comprehensive loss	$ (6,719)	$ (6,013)
Net loss per share, basic (in usd per share)	$ (0.05)	$ (0.08)
Net loss per share, diluted (in usd per share)	$ (0.05)	$ (0.08)
Weighted average shares used to compute basic net loss per share (in shares)	145,973,989	71,290,918
Weighted average shares used to compute diluted net loss per share (in shares)	145,973,989	71,290,918