Balance Sheet Items - Schedule of Prepaid Expenses and Other Current Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 703	$ 949
Prepaid research and development costs	304	632
Other current assets	263	553
Total	$ 1,270	$ 2,134