Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenues	$ 2,679	$ 3,131
Operating expenses:
Research and development	38,468	28,252
General and administrative	12,189	8,706
Total operating expenses	50,657	36,958
Loss from operations	(47,978)	(33,827)
Other income (expense):
Interest income	2,038	193
Other income (expense), net	(55)	17
Total other income, net	1,983	210
Loss before equity method investment	(45,995)	(33,617)
Loss on equity method investment	0	(1,010)
Net loss	$ (45,995)	$ (34,627)
Net loss per share:
Net loss per share - basic	$ (0.85)	$ (0.73)
Net loss per share - diluted	$ (0.85)	$ (0.73)
Weighted average shares - basic	53,908	47,712
Weighted average shares - diluted	53,908	47,712
Other comprehensive income (loss):
Unrealized gain (loss) on investment securities	$ 1,417	$ (1,810)
Comprehensive loss	$ (44,578)	$ (36,437)