Warrant Liability

6 Months Ended

Jun. 30, 2013

Warrant Liability [Abstract]

Warrant Liability

Note 10 - Warrant Liability

In July 2008, the Company completed a registered direct offering of 6,686,650 units, raising approximately $17.5 million in net proceeds. Each unit consisted of one share of common stock and a warrant to purchase 0.5 shares of common stock (the "Warrants") at a price of $2.68 per unit. The Warrants represent the right to acquire an aggregate of 3,343,325 shares of common stock at an exercise price of $3.62 per share and were exercisable between January 31, 2009 and July 31, 2013.

During the six months ended June 30, 2013 and 2012, the Company recorded as other income (expense) in its statements of operations a change in fair value of warrant liability of $0.3 million and $0 million, respectively. As of June 30, 2013, the warrant liability recorded on the balance sheet was $0 million. All Warrants expired unexercised on July 31, 2013.