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SIGNIFICANT ACCOUNTING POLICIES - Concentration Risk (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]      
Percentage of concentration of domestic financial institutions in cash and cash equivalents, customer funds 47.00% 42.00%  
Percentage of cash and cash equivalents, customer funds denominated in U.S dollars 70.00% 65.00%  
Customer concentration risk | Total revenues | Customers from single market place      
Concentration Risk [Line Items]      
Percentage of total revenue 29.00% 27.00% 30.00%
Customer concentration risk | Total revenues | Greater China      
Concentration Risk [Line Items]      
Percentage of total revenue 37.00% 33.00% 38.00%