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Common Stock
 9 Months Ended
Sep. 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 nine months ended September 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 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 nine months ended September 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 September 30, 2013.

During the three months ended March 31, 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. There are no shares of common stock of the Company remaining for sale under this sales agreement or registered pursuant to registration statement on Form S-3 (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. During the three months ended September 30, 2013, the Company sold approximately 6.4 million shares of its common stock under the March 2013 Sales Agreement with Cowen and Company, LLC for proceeds of approximately $2.2 million, with net cash proceeds after related expenses of approximately $2.3 million. The shares were issued pursuant to registration statement on Form S-3 (333-187230). 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 nine months ended September 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.