Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
License revenues	$ 3,131	$ 0
Type of Revenue Extensible List	us-gaap:GrantMember	us-gaap:GrantMember
Operating expenses:
Research and development	$ 28,252	$ 17,584
General and administrative	8,706	5,334
Total operating expenses	36,958	22,918
Loss from operations	(33,827)	(22,918)
Other income (expense):
Interest income	193	30
Other expense, net	17	(13)
Loss before equity method investment	(33,617)	(22,901)
Loss from equity method investment	(1,010)	0
Total other income (expense), net	210	17
Net loss	$ (34,627)	$ (22,901)
Net loss per share:
Net loss per share – basic and diluted	$ (0.73)	$ (0.69)
Weighted average shares outstanding – basic and diluted	47,712	33,012
Other comprehensive income (loss):
Unrealized gain (loss) on investment securities	$ (1,810)	$ (6)
Comprehensive loss	$ (36,437)	$ (22,907)