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STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Schedule of warrant activity

Summary of our Warrant activity and related information for 2012-2014

		Number of Shares Under Warrants				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life in Years				Aggregate Intrinsic Value
Balance at December 31, 2011			3,057,627			$	0.36				7.9			$	3,483,691
Issued			17,332,500			$	1.26
Exercised			(8,145,486	)		$	0.38
Expired			—
Cancelled			(51,142	)		$	0.24
Balance at December 31, 2012			12,193,499			$	1.63				4.8			$	17,971,994
Issued			2,100,000			$	2.72
Exercised			—
Expired			—
Cancelled			—
Balance at December 31, 2013			14,293,499			$	1.79				3.9			$	48,932,777
Issued			—
Exercised			(365,583	)		$	0.50
Expired			—
Cancelled			—
Balance at December 31, 2014			13,927,916			$	1.82				3.0			$	36,623,875
Vested and Exercisable at December 31, 2014			13,562,764			$	1.83				2.9			$	35,599,540

Schedule of weighted average fair value per share and assumptions used in the Black-Scholes Model of warants

The weighted average fair value per share of warrants issued and the assumptions used in the Black-Scholes Model during the years ended December 31, 2014, 2013 and 2012 are set forth in the table below.

		2014				2013				2012
Weighted average fair value		$	—			$	2.83			$	2.05
Risk-free interest rate			—	%			0.88-1.12	%			0.72-1.04	%
Volatility			—	%			44.29-45.89	%			44.64-44.81	%
Term (in years)			—				5-6				5
Dividend yield			0.00	%			0.00	%			0.00	%

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

The assumptions used in the Black-Scholes Model during the years ended December 31, 2014, 2013 and 2012 are set forth in the table below.

		2014				2013				2012
Risk-free interest rate			0.07-1.77	%			0.65-1.71	%			0.61-2.23	%
Volatility			68.05-82.29	%			33.35-45.76	%			40.77-46.01	%
Term (in years)			0.5-6.25				5-6.25				5-6.25
Dividend yield			0.00	%			0.00	%			0.00	%

Schedule of option activity

A summary of activity under the 2009 and 2012 Plans and related information for 2012-2014 follows:

		Number of Shares Under Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life in Years				Aggregate Intrinsic Value
Balance at December 31, 2011			10,590,161			$	0.16				7.6			$	14,067,649
Granted			5,121,250			$	2.80
Exercised			(1,931,788	)
Expired			—
Cancelled			(46,135	)
Balance at December 31, 2012			13,733,488			$	1.16				7.7			$	26,804,117
Granted			2,583,677			$	3.31
Exercised			(75,423	)
Expired			(250	)
Cancelled			(608,750	)
Balance at December 31, 2013			15,632,742			$	1.44				7.2			$	58,878,132
Granted			2,442,000			$	4.71
Exercised			(854,573	)
Expired			(250	)
Cancelled			(427,476	)
Balance at December 31, 2014			16,792,443			$	1.88				6.9			$	43,996,311
Vested and Exercisable at December 31, 2014			13,276,462			$	1.39				5.5			$	40,720,977

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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