Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 0	$ 0
Operating expenses:
Research and development	3,991	17,967
General and administrative	11,357	9,680
Restructuring and other costs	928
Total operating expenses	16,276	27,647
Loss from operations	(16,276)	(27,647)
Other income (expense), net	544	318
Net loss	$ (15,732)	$ (27,329)
Net loss per share - basic	$ (3.42)	$ (6.02)
Net loss per share - diluted	$ (3.42)	$ (6.02)
Weighted average common shares outstanding - basic	4,598,715	4,539,318
Weighted average common shares outstanding - diluted	4,598,715	4,539,318
Comprehensive loss:
Net Income (Loss)	$ (15,732)	$ (27,329)
Other comprehensive gain (loss):
Unrealized gain on short-term investments, net of tax of $0	48	(35)
Foreign currency translation adjustments	(63)
Total other comprehensive loss	(15)	(35)
Total comprehensive loss	$ (15,747)	$ (27,364)