EQUITY BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Fair Value Assumptions

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model. The following assumptions were used for the years ended December 31, 2018, 2017, and 2016:

	2018			2017			2016
Risk-free interest rate (weighted average)		2.77	%		2.05	%		1.31	%
Expected dividend yield		0	%		0	%		0	%
Expected stock price volatility		90	%		90	%		90	%
Expected life of options (weighted average)		5.61 years			5.56 years			4.87 years

Summary of All Stock Option Activity

A summary of all stock option activity since December 31, 2016 is as follows:

						Weighted
				Weighted		Average
				Average		Remaining	Aggregate
	Number of Options			Exercise Price		Contractual Term	Intrinsic Value
Outstanding at December 31, 2016		5,650,679		$	1.04
Granted in 2017		2,692,000		$	1.76
Exercised in 2017		(85,988	)	$	0.79
Expired in 2017		(100,000	)	$	1.43
Outstanding at December 31, 2017		8,156,691		$	1.28
Granted in 2018		1,631,841		$	2.64
Exercised in 2018		(612,259	)	$	0.87
Expired / cancelled in 2018		(504,191	)	$	1.71
Outstanding at December 31, 2018		8,672,082		$	1.54	5.8 years	$	8,193,642
Exercisable at December 31, 2018		5,202,555		$	1.37	4.4 years	$	5,498,675