Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue:
Net product revenue	$ 477	$ 1,352
Costs and expenses:
Research and development	7,726	8,834
Selling, general and administrative	4,395	4,419
Total costs and expenses	12,121	13,253
Operating loss	(11,644)	(11,901)
Other income (expense):
Total other income (expense), net	73	(6)
Net loss	$ (11,571)	$ (11,907)
Net loss per share, basic and diluted (in dollars per share)	$ (0.55)	$ (0.67)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	21,179,974	17,720,972
Product [Member]
Revenue:
Net product revenue	$ 0	$ 3
Collaboration Agreement [Member]
Revenue:
Net product revenue	$ 477	$ 1,349