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LEASES - Components of lease expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating Lease expense        
Total operating lease expense $ 1,113 $ 915 $ 2,219 $ 1,525
Finance Lease expense        
Total amortization of leased assets 29 28 59 54
Interest on lease liabilities 9 20 19 28
Total net lease cost 38 48 78 82
Costs of revenue - devices and supplies        
Operating Lease expense        
Total operating lease expense 100 181 201 359
Finance Lease expense        
Total amortization of leased assets 15 14 31 26
Sales and marketing expense.        
Operating Lease expense        
Total operating lease expense 126 76 257 133
General and administrative        
Operating Lease expense        
Total operating lease expense 887 658 1,761 1,033
Finance Lease expense        
Total amortization of leased assets $ 14 $ 14 $ 28 $ 28