STOCKHOLDERS' EQUITY (Tables)

9 Months Ended

Sep. 30, 2015

Stockholders' Equity Note [Abstract]

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

The assumptions used in the Black-Scholes Model during the nine months ended September 30, 2015 and 2014 are set forth in the table below.

	Nine Months Ended September 30,
	2015			2014
Risk-free interest rate		1.47-1.54	%		1.68-1.77	%
Volatility		58.77-62.94	%		69.15-70.93	%
Term (in years)		5.27-6.25			5-6.25
Dividend yield		0.00	%		0.00	%

Schedule of option 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, 2014		16,792,443		$	1.88		6.92	$	43,996,311
Granted		1,231,000		$	6.38
Exercised		(472,867	)	$	1.25
Expired/Forfeited		(136,334	)	$	3.01
Balance at September 30, 2015		17,414,242		$	2.21		6.09	$	64,265,785
Vested and Exercisable at September 30, 2015		13,848,923		$	1.59		5.49	$	59,095,453