STOCK PURCHASE WARRANTS: (Tables)

6 Months Ended

Jun. 30, 2014

	January 2010 Class A Warrants		December 2010 Warrants		August 2013 Warrants
Exercise price	$	18.09	$	3.30	$	4.80
Expiration date	July 21, 2015		December 15, 2015		August 16, 2018
Total shares issuable on exercise	226,299		15,405		1,087,450

Schedule of assumptions used in calculating estimated fair value of warrants

January 2010 Class A Warrants	June 30, 2014			December 31, 2013
Closing stock price	$	4.10		$	3.23
Expected dividend rate	0		%	0		%
Expected stock price volatility	130.4		%	84.6		%
Risk-free interest rate	0.2		%	0.3		%
Expected life (years)	1.00			1.50

December 2010 Warrants	June 30, 2014			December 31, 2013
Closing stock price	$	4.10		$	3.23
Expected dividend rate	0		%	0		%
Expected stock price volatility	123.4		%	80.4		%
Risk-free interest rate	0.3		%	0.4		%
Expected life (years)	1.46			1.96

August 2013 Warrants	June 30, 2014		December 31, 2013
Closing stock price	4.10		$	3.23
Expected dividend rate	0	%	0		%
Expected stock price volatility	89.9	%	77.5		%
Risk-free interest rate	1.4	%	1.6		%
Expected life (years)	4.13		4.63

- Definition

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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