Balance Sheet Items - Schedule of Prepaid Expenses and Other Current Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 700	$ 703
Prepaid research and development costs	337	304
Other current assets	96	263
Total	$ 1,133	$ 1,270