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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Deferred revenue $ 7.6 $ 4.2
Revenue recognized that was previously deferred $ 2.9  
Hemodynamic Monitors    
Revenue, Initial Application Period Cumulative Effect Transition [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.