Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid contracted research and development costs	$ 1,578	$ 1,902
R&D tax credit receivable	771	838
VAT receivable	159	306
Prepaid insurance	260	427
Deposits and other	178	356
Total prepaid expenses and other current assets	$ 2,946	$ 3,829