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Other Liabilities (Schedule of Other Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Liabilities [abstract] |  |
Restricted share units (note 20) | $ 2,264 | $ 246
Other non-current liabilities | 259 | 253
Other liabilities | $ 2,523 | $ 499

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