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Subsequent Event
12 Months Ended
Dec. 31, 2018
Subsequent Events [Abstract]  
Subsequent Events
 SUBSEQUENT EVENT

On February 11, 2019, the Company entered into an agreement and plan of merger to acquire CAS Medical Systems, Inc. ("CASMED") for an aggregate cash purchase price of $2.45 per share of common stock, or an equity value of approximately $100.0 million.  CASMED is a medical technology company dedicated to non-invasive monitoring of tissue oxygenation in the brain. The Company plans to integrate the acquired technology platform into its hemodynamic monitoring platform.  The acquisition will be accounted for as a business combination, and is expected to consist primarily of intangible assets.  The Company is in the process of evaluating the potential impact of the business combination on its consolidated financial statements.