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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 29, 2020
May 07, 2020
Dec. 31, 2020
Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Stock split, conversion ratio 300.00% 300.00%    
Deferred revenue     $ 6.3 $ 8.4
Revenue recognized that was previously deferred     $ 6.3 $ 5.5
Hemodynamic Monitors        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract length     The Company sells separately priced service contracts, which range from 12 to 36 months, to owners of its hemodynamic monitors.