Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

At September 30, 2013 and 2012 there were warrants outstanding to purchase 5,620,128 shares of our common stock, respectively. The warrants outstanding as of September 30, 2013 and December 31, 2012 were as follows:

Number of Common Shares Underlying Warrants			Issue Date/Exercisable Date	Exercise Price		Expiration Date
	100,778	(1)	Mar-07 / Mar-07	$	3.97	Mar-17
	705,354	(2)	Mar-09 / Sep-09	$	3.00	Sep-14
	2,572,775	(1)	Jul-09 / Jan-10	$	2.50	Jan-15
	500,000	(2)	Apr-10 / Oct-10	$	1.89	Oct-15
	1,323,214	(2)	Jul-10 / Jan-11	$	1.63	Jan-17
	371,423	(2)	Jun-11 / Jun-11	$	3.50	Jun-16
	46,584	(1)	Mar-12 / Mar-12	$	1.61	Mar-22
	5,620,128

(1)

These warrants to purchase common stock are classified as equity.

(2)

Because of the presence of net settlement provisions, these warrants to purchase common stock are classified as derivative liabilities. The fair value of these liabilities (see Note 4) is remeasured at the end of every reporting period and the change in fair value is reported in the unaudited condensed consolidated statements of operations as other income (expense).

- 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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