Preferred Stock, Common Stock and Warrants (Tables)

12 Months Ended

Dec. 31, 2013

Warrants Issued to Purchase Common Stock

In connection with a 2007 loan agreement that was subsequently terminated in 2008, we issued warrants to purchase up to 3,550,000 shares of our common stock as follows:

Warrant Issuance Date	Shares Issuable (in thousands)		Expiration Date	Exercise Price per Share		Outstanding as of December 31, 2013 (in thousands)
July 18, 2007		1,250	2/26/2014	$	5.13		1,250
October 18, 2007		1,300	2/26/2014	$	1.68		-
December 27, 2007		300	2/26/2014	$	5.65		300
December 27, 2007		700	2/26/2014	$	1.68		-
Total		3,550					1,550

- 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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