Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 20,729	$ 15,879
General and administrative	7,463	4,605
Total operating expenses	28,192	20,484
Loss from operations	(28,192)	(20,484)
Other income (expense):
Interest income	958	438
Investment advisory fees	(169)	(108)
Change in fair value of warrant liability	6,324	(293)
Net (loss) gain on marketable securities	(214)	45
Total other income (expense), net	6,899	82
Loss before income taxes	(21,293)	(20,402)
Provision for income taxes	0	0
Net loss	$ (21,293)	$ (20,402)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.10)	$ (0.12)
Weighted average common shares outstanding, basic and diluted	213,411	169,659
Comprehensive loss:
Net loss	$ (21,293)	$ (20,402)
Other comprehensive income, net of taxes:
Unrealized loss on available-for-sale securities	(5,032)	(576)
Comprehensive loss	$ (26,325)	$ (20,978)