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STOCKHOLDERS' EQUITY (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity:

Schedule of assumptions used in the Black-Scholes Model of stock options

The assumptions used in the Black-Scholes Model for options granted during the nine months ended September 30, 2018 and 2017 are set forth in the table below.

		Nine Months Ended September 30,
		2018				2017
Risk-free interest rate			2.78-2.82%				1.84-2.01%
Volatility			61.80-63.34%				61.56-63.95%
Term (in years)			5.5-6.25				5.5-6.25
Dividend yield			0.00	%			0.00	%

Schedule of 2009 and 2012 Plans activity

A summary of activity under the 2009 and 2012 Plans and related information follows:

		Number of Shares Underlying  Stock Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life in Years				Aggregate Intrinsic Value
Balance at December 31, 2017			23,365,225			$	3.78				5.1			$	64,664,821
Granted			3,006,500			$	5.50
Exercised			(1,456,876	)		$	0.85							$	8,025,055
Expired/Forfeited			(77,500	)		$	7.41
Balance at September 30, 2018			24,837,349			$	4.15				5.2			$	68,682,857
Vested and Exercisable at September 30, 2018			19,661,975			$	3.65				4.3			$	64,794,996
Unvested at September 30, 2018			5,175,374			$	6.04				8.9			$	3,887,861

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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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