STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating expenses:
Research and development	$ 13,336	$ 12,706
General and administrative	8,227	5,954
Total operating expenses	21,563	18,660
Loss from operations	(21,563)	(18,660)
Other income, net	9	367
Net loss	$ (21,554)	$ (18,293)
Basic and diluted net loss per share	$ (0.10)	$ (0.09)
Weighted average common shares outstanding used to compute basic and diluted net loss per share	213,954,665	199,814,768