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Income Tax - Year of Expiration and Amount of Available Unused Net Operating Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | $ 15,245 | $ 17,298
2021 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses |  | 3,905
2022 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 2,090 | 2,437
2023 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 4,353 | 4,299
2024 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 3,156 | 3,226
2025 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 1,912 | 1,811
2026 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 3,184 |
No expiration [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | $ 550 | $ 1,620

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