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LEASES - Lease cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
LEASES    
Total operating lease expense $ 4,458 $ 3,549
Total amortization of right-of-use asset 119 104
Interest expense and other 36 41
Total finance lease expense 155 145
Costs of revenue - devices and supplies    
LEASES    
Total operating lease expense 359 399
Sales and marketing expense    
LEASES    
Total operating lease expense 1,456 1,186
Total amortization of right-of-use asset 117 104
General and administrative    
LEASES    
Total operating lease expense 2,643 1,964
Total amortization of right-of-use asset $ 2 $ 1