CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues:
Total revenues	$ 26	$ 11	$ 155	$ 320
Operating expenses:
Research and development	19,646	17,396	56,918	53,144
General and administrative	5,173	9,304	15,252	19,431
Total operating expenses	24,819	26,700	72,170	72,575
Loss from operations	(24,793)	(26,689)	(72,015)	(72,255)
Other income:
Interest income and other, net	1,914	2,703	6,582	8,321
Net loss	(22,879)	(23,986)	(65,433)	(63,934)
Other comprehensive loss:
Unrealized gain (loss) on debt investments, net	466	188	251	(288)
Comprehensive loss	$ (22,413)	$ (23,798)	$ (65,182)	$ (64,222)
Per share information:
Net loss, basic (in dollars per share)	$ (0.26)	$ (0.27)	$ (0.73)	$ (0.72)
Net loss, diluted (in dollars per share)	$ (0.26)	$ (0.27)	$ (0.73)	$ (0.72)
Weighted-average shares outstanding, basic (in shares)	89,701,117	88,620,666	89,531,017	88,500,813
Weighted-average shares outstanding, diluted (in shares)	89,701,117	88,620,666	89,531,017	88,500,813
Contract and grant revenue
Revenues:
Total revenues	$ 26	$ 11	$ 155	$ 271
Licensing revenue
Revenues:
Total revenues	$ 0	$ 0	$ 0	$ 49