Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 9,566	$ 15,339
General and administrative	4,260	5,428
Total operating expenses	13,826	20,767
Loss from operations	(13,826)	(20,767)
Interest and other income (expense), net	(9)	372
Net loss	$ (13,835)	$ (20,395)
Net loss per share, basic and diluted	$ (0.18)	$ (0.28)
Weighted average common shares used to compute net loss per share, basic and diluted	78,468	72,247