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OTHER INCOME (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
OTHER INCOME |  |  |
Unrealized and realized gain (loss) on investments (note 5) | $ 5,259 | $ (3,324) | $ 257
Foreign currency gain | 1,697 | 3,922 | 694
Other income | 184 | 570 | 270
Total other income | $ 7,140 | $ 1,168 | $ 1,221

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