Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenue	$ 13,853,000	$ 9,124,000	$ 24,542,000	$ 18,003,000
Operating expenses:
Research and development	10,808,000	9,610,000	20,551,000	18,882,000
General and administrative	3,145,000	3,105,000	6,883,000	6,820,000
Total operating expenses	13,953,000	12,715,000	27,434,000	25,702,000
Loss from operations	(100,000)	(3,591,000)	(2,892,000)	(7,699,000)
Other income, net:
Interest expense		(259,000)		(491,000)
Interest income	371,000	627,000	811,000	1,266,000
Other income (expense), net	197,000	(112,000)	(185,000)	(291,000)
Total other income, net	568,000	256,000	626,000	484,000
Income (loss) before income taxes	468,000	(3,335,000)	(2,266,000)	(7,215,000)
Income tax expense	0	8,000	0	68,000
Net income (loss)	468,000	(3,343,000)	(2,266,000)	(7,283,000)
Other comprehensive income (loss), net:
Unrealized (loss) gain on available-for-sale securities, net	(6,000)	(36,000)	(28,000)	59,000
Foreign currency translation (loss) gain	(166,000)	71,000	139,000	205,000
Total other comprehensive (loss) income, net	(172,000)	35,000	111,000	264,000
Comprehensive income (loss)	$ 296,000	$ (3,308,000)	$ (2,155,000)	$ (7,019,000)
Net income (loss) share, basic	$ 0.01	$ (0.1)	$ (0.06)	$ (0.21)
Net income (loss) per share, diluted	$ 0.01	$ (0.1)	$ (0.06)	$ (0.21)
Weighted-average number of common shares outstanding, basic	35,292,035	34,449,769	35,273,394	34,432,057
Weighted-average number of common shares outstanding, diluted	36,589,774	34,449,769	35,273,394	34,432,057