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STOCK-BASED COMPENSATION (Details 3) - 2015 Stock Option Plan [Member] - Performance Based Share Options [Member] - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dividend yield 0.00%
Expected Volatility 58.90%
Weighted-average volatility
Expected dividends
Expected term (in years) 10 years  
Risk-free rate 2.07%