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Common Stock
 6 Months Ended
Jun. 30, 2013
Common Stock [Abstract]  
Common Stock
(9)Common Stock

In December 2012, the Company entered into a Common Stock Purchase Agreement (Purchase Agreement) with Terrapin Opportunity, L.P. (Terrapin) for a committed equity financing facility (CEFF) program. The Purchase Agreement provides that Terrapin is committed to purchase up to $35,000,000 of our common stock over the 24-month term of the Purchase Agreement. During the six months ended June 30, 2013 the Company sold approximately 5.6 million shares of its common stock through the program. The Company received proceeds of approximately $9.0 million, with net cash proceeds after related expenses from this transaction of approximately $8.9 million. The shares were issued pursuant to an effective registration statement on Form S-3 (333-183675).  The net proceeds will be used for general corporate purposes, including, but not limited to, commercialization of our products, obtaining regulatory approvals, funding of our clinical trials, capital expenditures and working capital. In addition to the $9.0 million raised during the six months ended June 30, 2013, the Company previously raised $2.1 million under the CEFF program. As a result, there was approximately $23.9 million available under this CEFF program as of June 30, 2013.

During the six months ended June 30, 2013, the Company sold approximately 14.2 million shares of its common stock under a sales agreement with Cowen and Company, LLC through an “at the market” equity offering program for proceeds of approximately $20.9 million, with net cash proceeds after related expenses of approximately $20.8 million. The net proceeds will be used for general corporate purposes, including, but not limited to, commercialization of our products, obtaining regulatory approvals, funding of our clinical trials, capital expenditures and working capital.  There are no shares of common stock of the Company remaining for sale under the program or registered pursuant to registration statement 333-165677.

On March 13, 2013, the Company entered into a new sales agreement (the “March 2013 Sales Agreement”) with Cowen and Company, LLC to sell shares of the Company’s common stock, par value $.01 per share, having aggregate sales proceeds of $50,000,000, from time to time, through an “at the market” equity offering program under which Cowen and Company, LLC will act as sales agent. The net proceeds will be used for general corporate purposes, including, but not limited to, commercialization of our products, obtaining regulatory approvals, funding of our clinical trials, capital expenditures and working capital.

During the six months ended June 30, 2013, the Company issued 0.2 million shares of its common stock upon the exercise of 2012 Warrants for proceeds of approximately $0.2 million.