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Other Liabilities (Schedule of Other Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Other Liabilities [abstract] |  |
Restricted share units (note 20) | $ 246 | $ 125
Other non-current liabilities | 253 | 1,041
Other liabilities | $ 499 | $ 1,166

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