Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Prepaid Expense and Other Assets [Abstract]
Prepaid research and development expenses	$ 1,031	$ 676
Prepaid insurance	186	944
Payroll tax receivable	237	208
Other prepaid expenses and other assets	366	279
Total prepaid expenses and other current assets	$ 1,820	$ 2,107