Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue, Product and Service [Extensible Enumeration]	Collaboration Agreement [Member]	Collaboration Agreement [Member]
Total revenue	$ 55	$ 64
Research and development	1,241	2,384
Selling, general and administrative	1,089	1,190
Total costs and expenses	2,330	3,574
Operating loss	(2,275)	(3,510)
Total other income, net	8	9
Net loss	$ (2,267)	$ (3,501)
Net loss per share, basic and diluted (in dollars per share)	$ (0.09)	$ (0.17)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	25,133,093	20,177,167