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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
COMMITMENTS AND CONTINGENCIES        
Expenses incurred under the operating lease agreements $ 1.6 $ 1.6 $ 3.2 $ 3.1