Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Expected federal income tax benefit	$ (6,320)	$ (5,662)
Disallowed R&D expenses	9	351
Non-taxable R&D rebate	(7)	(156)
Other permanent items	738	214
Return to provision	47	862
Stock-based compensation	682	213
Foreign rate differential	(453)	(270)
Other	(2)	27
Effect of change in valuation allowance	5,306	4,421
Income tax benefit	$ 0	$ 0