Stockholders' Equity

3 Months Ended

Mar. 31, 2012

Stockholders' Equity

Stockholders' Equity

(9) Stockholders’ Equity

In January 2011, the Company entered into a controlled equity offering sales agreement (the “Cantor Agreement”) with Cantor Fitzgerald & Co. (Cantor) pursuant to which the Company may issue and sell up to 5,000,000 shares of its common stock from time to time through Cantor, acting as agent. The Company agreed to pay Cantor a commission of up to 5% of the gross proceeds from each sale and to reimburse Cantor for certain expenses incurred in connection with entering into the Cantor Agreement. The Cantor Agreement terminates upon the sale of all 5,000,000 shares or upon ten day notice by either Cantor or the Company. During the year ended December 31, 2011, the Company sold 575,000 shares of common stock under the Cantor Agreement and raised $2.2 million in net proceeds, after deducting commission and offering expenses. During the three months ended March 31, 2012, the Company sold 2,450,000 shares of common stock under the Cantor Agreement and raised $8.5 million in net proceeds. Under the terms of the Cantor Agreement, the Company has the ability to sell up to 1,975,000 shares of its common stock upon the expiration or earlier waiver of the 90-day lock-up with the underwriters of the Company’s recent offering in February 2012.

During the three months ended March 31, 2012, the Company issued 12,075,000 shares of its common stock in an underwritten public offering, including the underwriter’s exercise of their full over-allotment option to purchase an additional 1,575,000 shares of common stock. The net proceeds to the Company were $43.4 million, after deducting underwriting fees and offering expenses.