Supplemental Financial Information - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Disclosure of Accrued Expenses and Other Current Liabilities [Line Items]
Research and development	$ 2,837	$ 2,623
Compensation and other employee liabilities	1,455	1,102
Legal	67	130
Other	37	204
Total accrued expenses and other current liabilities	$ 4,396	$ 4,059