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STOCK-BASED COMPENSATION - Schedule of stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
STOCK-BASED COMPENSATION |  |  |  |
Stock-based compensation expense | $ 2,837 | $ 937 | $ 5,885 | $ 4,136

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