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OTHER INCOME - Summary of Other Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
OTHER INCOME |  |  |  |
COVID-19 relief | $ 611 | $ 2,628 | $ 3,447 | $ 5,319
Unrealized and realized gain (loss) on investments (Note 5) | 18 |  | 20 | (619)
Foreign currency gain (loss) | 654 | (132) | 751 | 1,736
Other income, net |  |  | 2,300 |
Other income, net | (19) | (406) | 2,253 | (365)
Total other income | $ 1,264 | $ 2,090 | $ 6,471 | $ 6,071

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