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SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition - Deferred Customer Acquisition Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
SIGNIFICANT ACCOUNTING POLICIES    
Capitalized Contract Cost, Amortization Period 1 year 9 months 18 days  
Capitalized Contract Cost, Impairment Loss $ 0 $ 0
Opening balance 11,366 8,976
Additions to deferred customer acquisition costs 3,555 2,628
Amortization of deferred customer acquisition costs (2,749) (2,089)
Ending balance $ 12,172 $ 9,515