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PREFERRED STOCK AND SHAREHOLDERS' EQUITY - 2007 Plan (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Options to purchase common stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options authorized 26,814,848    
Number of shares to be purchased for one option 1    
Common stock, par value $ 0.01    
Options to purchase common stock | Share Incentive Plan 2007 And 2007 U.s. Share Incentive Plan Member      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options were reserved for grants to employees 3,360,000    
Options to purchase common stock | 2017 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 21,756,714