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REVENUE - Contract Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Contract With Customer, Liability [Roll Forward]      
Beginning balance at January 1 $ 52,410 $ 20,728 $ 11,859
Upfront payments received from customers 12,053    
Upfront or annual incentive payments received 1,772    
Revenue recognized related to amounts that were included in beginning balance of deferred revenue (9,860) 9,764 4,830
Revenue recognized related to deferred revenue generated during the period (973)    
Ending balance at December 31 $ 55,402 $ 52,410 $ 20,728