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SIGNIFICANT ACCOUNTING POLICIES - Deferred Customer Acquisition Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SIGNIFICANT ACCOUNTING POLICIES      
Capitalized Contract Cost, Amortization Period 1 year 9 months 2 years 4 months 6 days  
Opening balance $ 8,976 $ 5,057 $ 285
Additions to deferred customer acquisition costs 2,628 10,119 6,981
Amortization of deferred customer acquisition costs (2,089) (6,200) (2,209)
Ending balance $ 9,515 $ 8,976 $ 5,057