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OTHER INCOME - Summary of Other Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
OTHER (EXPENSE) INCOME |  |  |  |
COVID Relief | $ 2,691 |  | $ 2,691 |
Unrealized and realized (loss) gain on investments (note 6) | 279 | $ 925 | (619) | $ 1,752
Foreign currency gain (loss) | 60 | (537) | 1,868 | (374)
Other income, net | 14 | 75 | 41 | 132
Total other (expense) income | $ 3,044 | $ 463 | $ 3,981 | $ 1,510

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