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Income Tax - Year of Expiration and Amount of Available Unused Net Operating Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | $ 20,580 | $ 16,762
2019 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses |  | 784
2020 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 3,067 | 3,020
2021 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 5,246 | 5,121
2022 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 2,216 | 2,105
2023 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 4,855 | 4,760
2024 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | 3,605 |
No expiration [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Unused net operating losses | $ 1,591 | $ 972

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