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SIGNIFICANT ACCOUNTING POLICIES - Property, equipment and software, net (Details)
12 Months Ended
Dec. 31, 2020
Minimum | Computers, software and peripheral equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 3 years
Minimum | Furniture and office equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 6 years
Maximum | Computers, software and peripheral equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 5 years
Maximum | Furniture and office equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 16 years