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SIGNIFICANT ACCOUNTING POLICIES - Transaction costs, Sales and marketing expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SIGNIFICANT ACCOUNTING POLICIES      
Allowance for transaction losses $ 2,334 $ 1,532 $ 410
Advertising and certain marketing costs $ 7,740 $ 5,760 $ 8,571