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ACQUISITION - Narrative (Details) - CAS Medical Systems, Inc. - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Apr. 18, 2019
Feb. 11, 2019
Sep. 30, 2019
Business Acquisition [Line Items]      
Consideration per share to be transferred (in dollars per share)   $ 2.45  
Acquisition price, subject to certain adjustments   $ 100.0  
Cash purchase price $ 100.8    
Acquisition-related costs     $ 2.0
Developed technology      
Business Acquisition [Line Items]      
Weighted average useful life 14 years    
Customer relationships      
Business Acquisition [Line Items]      
Weighted average useful life 10 years