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STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2016

Stockholders' Equity Note [Abstract]

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 three months ended March 31, 2016 and 2015 are set forth in the table below.

		Three Months Ended March 31, 2016				Three Months Ended March 31, 2015
Risk-free interest rate			1.70	%			1.47	%
Volatility			71.22	%			58.78-62.59	%
Term (in years)			6.25				5.27-6.25
Dividend yield			0.00	%			0.00	%

Schedule of plan 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, 2015			20,725,325			$	3.28				6.5			$	146,864,184
Granted			185,500			$	7.59
Exercised			(340,045	)		$	2.31							$	2,051,619
Expired/Forfeited			(1,125	)		$	3.59
Balance at March 31, 2016			20,569,655			$	3.34				6.3			$	71,940,245
Vested and Exercisable at March 31, 2016			15,988,578			$	2.17				5.5			$	69,261,183
Unvested at March 31, 2016			4,581,077			$	7.42				9.2			$	2,679,062

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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