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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Millions
Aug. 12, 2019
Aug. 06, 2019
Forecast    
Subsequent Event [Line Items]    
Consideration received $ 3.0  
Forecast | Murata Manufacturing Co., Ltd.    
Subsequent Event [Line Items]    
Consideration receivable, pending execution of multi-year commercial agreement $ 7.0  
Subsequent Event | Private Placement    
Subsequent Event [Line Items]    
Common stock subscriptions, amount   $ 10.0
Price per share (in dollars per share)   $ 2.53