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STOCK-BASED COMPENSATION - Schedule of stock-based compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
STOCK-BASED COMPENSATION        
Stock-based compensation expense $ 3,781 $ 917 $ 9,666 $ 5,053