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Income Tax - Year of Expiration and Amount of Available Unused Net Operating Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | $ 17,298 | $ 20,580
2020 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses |  | 3,067
2021 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 3,905 | 5,246
2022 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 2,437 | 2,216
2023 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 4,299 | 4,855
2024 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 3,226 | 3,605
2025 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 1,811 |
No expiration [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | $ 1,620 | $ 1,591

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