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RESTRICTED STOCK UNITS, STOCK OPTIONS AND WARRANTS - Assumptions of Fair Value of Stock Option Grants (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Expected life (in years) 6 years
Volatility (as a percent) 35.00%
Dividend yield (as a percent) 0.00%
Risk-free interest rate (as a percent) 2.50%
Fair value per common share on date of grant (USD per share) $ 5.50