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REVENUE (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Deferred revenue $ 6.0 $ 6.0 $ 4.2
Revenue recognized that was previously deferred $ 0.7 $ 1.3  
Hemodynamic Monitors | Minimum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Service contract period 12 months 12 months  
Hemodynamic Monitors | Maximum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Service contract period 36 months 36 months