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REVENUE (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred revenue $ 7.9 $ 7.6
Revenue recognized that was previously deferred $ 1.1  
Hemodynamic Monitors    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Contract length The Company sells separately priced service contracts, which range from 12 months to 36 months, to owners of its hemodynamic monitors.