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REVENUE - Deferred Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Deferred revenue, beginning of the period | $ 59,501 | $ 51,549 | $ 51,804 | $ 44,331
Deferred revenue, end of the period | 58,684 | 53,166 | 58,684 | 53,166
Deferred revenue arising from business combination | 1,068 | 800 | 6,448 | 800
Revenue recognized in the period from amounts included in deferred revenue at the beginning of the period | $ 25,867 | $ 17,560 | $ 40,293 | $ 33,885

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