Warrant Liability	12 Months Ended
Dec. 31, 2011
Warrant Liability	Note 7 — 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 through July 31, 2013. During 2011, 2010 and 2009, the Company recorded as other income (expense) in its statements of operations a change in fair value of warrant liability of $2.5 million, $1.7 million and ($2.0) million, respectively. As of December 31, 2011, the warrant liability recorded on the balance sheet was $0.4 million and all Warrants remain outstanding as of that date under this offering.

Note 7 — 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 through July 31, 2013.

During 2011, 2010 and 2009, the Company recorded as other income (expense) in its statements of operations a change in fair value of warrant liability of $2.5 million, $1.7 million and ($2.0) million, respectively. As of December 31, 2011, the warrant liability recorded on the balance sheet was $0.4 million and all Warrants remain outstanding as of that date under this offering.