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RELATED PARTIES - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Feb. 28, 2018
Sep. 30, 2019
Related Party Transaction [Line Items]    
Proceeds from Warrant Exercises   $ 15.2
Class of Warrant or Right, Exercised   644,365
Common Stock Warrants    
Related Party Transaction [Line Items]    
Stock option expense $ 2.5