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LEASES - Lease cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases    
Total operating lease expense $ 6,516 $ 1,150
Total amortization of right-of-use asset 61 19
Interest expense and other 20 5
Total finance lease expense 81 24
Cost of Revenue    
Leases    
Total operating lease expense 740 121
Total amortization of right-of-use asset 7 2
Sales and marketing expense    
Leases    
Total operating lease expense 1,783 170
Total amortization of right-of-use asset 18 4
General and administrative    
Leases    
Total operating lease expense 3,993 859
Total amortization of right-of-use asset $ 36 $ 13