Consolidated Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 36,084,000	$ 15,759,000
Operating expenses:
Research and development	37,039,000	37,547,000
Acquired in-process research and development	0	23,049,000
General and administrative	13,567,000	17,239,000
Total operating expenses	50,606,000	77,835,000
Loss from operations	(14,522,000)	(62,076,000)
Other income (expense), net:
Interest expense	(491,000)	(1,053,000)
Interest income	2,334,000	420,000
Other (expense) income, net	(76,000)	281,000
Total other income (expense), net	1,767,000	(352,000)
Net loss before income tax expense	(12,755,000)	(62,428,000)
Income tax expense	580,000	0
Net loss	(13,335,000)	(62,428,000)
Other comprehensive income, net:
Unrealized gain (loss) on available-for-sale securities, net	108,000	(38,000)
Foreign currency translation (loss) gain	(44,000)	252,000
Total other comprehensive income, net	64,000	214,000
Comprehensive loss	$ (13,271,000)	$ (62,214,000)
Net loss per share, basic	$ (0.38)	$ (1.85)
Net loss per share, diluted	$ (0.38)	$ (1.85)
Weighted-average number of common shares outstanding, basic	34,726,384	33,727,945
Weighted-average number of common shares outstanding, diluted	34,726,384	33,727,945