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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets, Net of Valuation Allowance [Abstract] |  |
Tax loss carryforwards | $ 21,221 | $ 19,477
Research and development | 7,526 | 2,124
Issuance costs | 2,338 |
Employee and payroll accrued expenses | 763 | 654
Other | 44 | 42
Total deferred tax assets | 31,892 | 22,297
Less valuation allowance for deferred tax assets | (31,892) | (22,297)
Deferred tax assets | $ 0 | $ 0

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