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OTHER INCOME - Summary of Other Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
OTHER INCOME |  |  |
COVID-19 relief | $ 3,541 | $ 6,420 |
Unrealized and realized gain (loss) on investments (Note 5) | 28 | (619) | $ 5,259
Foreign currency gain | 513 | 1,078 | 1,697
Other income, net | 2,199 | 14 | 184
Total other income | $ 6,281 | $ 6,893 | $ 7,140

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