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Income Taxes - Summary of Taxes on Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Current Federal, State and Local, Tax Expense (Benefit) [Abstract] |  |  |
Domestic | $ 0 | $ 0 | $ 0
Foreign | 40 | 37 | 25
Total | 40 | 37 | 25
Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract] |  |  |
Domestic | 0 | 0 | 0
Foreign | 0 | 0 | 0
Total | 0 | 0 | 0
Provision for income taxes | $ 40 | $ 37 | $ 225

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