Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 9,124,000		$ 18,003,000
Operating expenses:
Research and development	9,610,000	$ 9,488,000	18,882,000	$ 20,251,000
Acquired in-process research and development				23,049,000
General and administrative	3,105,000	4,064,000	6,820,000	7,581,000
Total operating expenses	12,715,000	13,552,000	25,702,000	50,881,000
Loss from operations	(3,591,000)	(13,552,000)	(7,699,000)	(50,881,000)
Other income (expense), net:
Interest expense	(259,000)	(259,000)	(491,000)	(515,000)
Interest income	627,000	64,000	1,266,000	90,000
Other expense, net	(112,000)	(382,000)	(291,000)	(240,000)
Total other (expense) income, net	256,000	(577,000)	484,000	(665,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	(3,335,000)	(14,129,000)	(7,215,000)	(51,546,000)
Income tax expense	8,000	0	68,000	0
Net loss	(3,343,000)	(14,129,000)	(7,283,000)	(51,546,000)
Other comprehensive income (loss), net:
Unrealized (loss) gain on available-for-sale securities, net	(36,000)	(54,000)	59,000	(234,000)
Foreign currency translation gain	71,000	359,000	205,000	223,000
Total other comprehensive income (loss), net	35,000	305,000	264,000	(11,000)
Comprehensive loss	$ (3,308,000)	$ (13,824,000)	$ (7,019,000)	$ (51,557,000)
Net loss per share, basic	$ (0.1)	$ (0.41)	$ (0.21)	$ (1.56)
Net loss per share, diluted	$ (0.1)	$ (0.41)	$ (0.21)	$ (1.56)
Weighted-average number of common shares outstanding, basic	34,449,769	34,292,642	34,432,057	33,085,917
Weighted-average number of common shares outstanding, diluted	34,449,769	34,292,642	34,432,057	33,085,917