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SHARE-BASED COMPENSATION, STOCK OPTIONS, AND RESTRICTED SECURITIES, ASSUMPTIONS USED IN DETERMINING THE FAIR VALUE (Details) - Stock Options
3 Months Ended
Mar. 31, 2019
Assumptions used principally in determining the fair value of options granted  
Risk-free interest rate (as a percent) 2.55%
Expected dividend yield (as a percent) 0.00%
Expected term (employee grants) 6 years
Expected volatility (as a percent) 105.00%