STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 5,580	$ 13,336
General and administrative	3,505	8,227
Total operating expenses	9,085	21,563
Loss from operations	(9,085)	(21,563)
Other income (expense):
Other income (expense), net	(703)	9
Net loss	(9,788)	(21,554)
Net loss applicable to common stockholders	$ (9,788)	$ (21,554)
Basic and diluted net loss per share	$ (0.05)	$ (0.10)
Weighted average number of common shares outstanding used to compute basic and diluted net loss per share	214,946,569	213,954,665