Warrant Liability	3 Months Ended
Mar. 31, 2012
Warrant Liability	Note 6 – 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 are exercisable between January 31, 2009 and July 31, 2013. During the three months ended March 31, 2012 and 2011, the Company recorded as other income (expense) in its statements of operations and comprehensive loss a change in fair value of warrant liability of $0.1 million and $(0.1) million, respectively. As of March 31, 2012, the warrant liability recorded on the balance sheet was $0.3 million and all Warrants remain outstanding as of that date.

Note 6 – 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 are exercisable between January 31, 2009 and July 31, 2013.

During the three months ended March 31, 2012 and 2011, the Company recorded as other income (expense) in its statements of operations and comprehensive loss a change in fair value of warrant liability of $0.1 million and $(0.1) million, respectively. As of March 31, 2012, the warrant liability recorded on the balance sheet was $0.3 million and all Warrants remain outstanding as of that date.