CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Revenues	$ 362	$ 2	$ 389	$ 42
Operating expenses:
Research and development	18,388	20,262	48,890	51,359
General and administrative	4,514	4,492	13,805	13,329
Total operating expenses	22,902	24,754	62,695	64,688
Loss from operations	(22,540)	(24,752)	(62,306)	(64,646)
Other income (expense):
Interest expense	(29)	(64)	(33)	(191)
Interest income	1,884	1,053	5,387	1,402
Other income (expense), net	14	50	146	185
Total other income (expense), net	1,869	1,039	5,500	1,396
Net loss before income taxes	(20,671)	(23,713)	(56,806)	(63,250)
Income tax expense (benefit)		(197)		(197)
Net loss	(20,671)	(23,516)	(56,806)	(63,053)
Other comprehensive income - unrealized gain (loss) on short-term investments	56	(143)	103	(263)
Comprehensive loss	$ (20,615)	$ (23,659)	$ (56,703)	$ (63,316)
Net loss per share, basic	$ (0.39)	$ (0.48)	$ (1.10)	$ (1.37)
Net loss per share, diluted	$ (0.39)	$ (0.48)	$ (1.10)	$ (1.37)
Weighted-average common shares outstanding, basic	53,633,354	49,286,535	51,495,957	45,881,547
Weighted-average common shares outstanding, diluted	53,633,354	49,286,535	51,495,957	45,881,547