Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid materials, supplies and research and development services	$ 337	$ 820
Prepaid subscriptions, software and other administrative services	475	53
Prepaid Insurance	20	32
Prepaid expenses and other current assets	$ 832	$ 905