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SIGNIFICANT ACCOUNTING POLICIES - (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Customer concentration risk | Total revenues | One customer          
Concentration Risk [Line Items]          
Percentage of total revenue 2.00% 12.00% 5.00% 15.00% 13.00%