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OTHER INCOME - Summary of Other Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
OTHER INCOME |  |  |
COVID-19 Relief | $ 6,420 |  |
Unrealized and realized (loss) gain on investments (Note 6) | (619) | $ 5,259 | $ (3,324)
Foreign currency gain | 1,078 | 1,697 | 3,922
Other income, net | 14 | 184 | 570
Total other income | $ 6,893 | $ 7,140 | $ 1,168

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