CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 92	$ 17
Operating expenses:
Research and development	6,013	6,052
General and administrative	3,486	2,967
Total operating expenses	9,499	9,019
Loss from operations	(9,407)	(9,002)
Other income	1	31
Interest expense	(4)	(34)
Net loss	$ (9,410)	$ (9,005)
Net loss per share basic (in usd per share)	$ (0.08)	$ (0.15)
Net loss per share diluted (in usd per share)	$ (0.08)	$ (0.15)
Weighted-average shares used to compute net loss per share, basic	119,377,286	61,163,581
Weighted-average shares used to compute net loss per share, diluted	119,377,286	61,163,581