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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Deferred revenue $ 10.2 $ 6.3
Revenue recognized that was previously deferred excluding opening balance $ 7.3  
Revenue recognized that was previously deferred   $ 6.3
Hemodynamic Monitors | Minimum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years) 12 months  
Hemodynamic Monitors | Maximum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years) 36 months