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Common Stock
 3 Months Ended
Mar. 31, 2013
Common Stock [Abstract]  
Common Stock

Note 9. Common Stock

In June 2009, we entered into a sales agreement (2009 sales agreement) pursuant to which we had the option to sell up to $30 million of our common stock, from time to time, in at-the-market offerings. Between June 2009 and November 2012, we sold common stock under the 2009 sales agreement worth approximately $26.7 million. In December 2012, we amended the 2009 sales agreement (2012 amended sales agreement) to, among other things, raise the dollar amount of shares available to sell under the agreement back to $30 million. The sales agent is paid compensation up to 3% of gross proceeds pursuant to the terms of the agreement. The sales agreement, as amended, has been filed with the SEC.

In the first quarter of 2013 we sold a total of 782,755 shares of our common stock at a price per share of $2.06 for gross proceeds of approximately $1,616,000. The shares were sold under the 2012 amended sales agreement. The shares were offered under our shelf registration statement previously filed with, and declared effective by, the SEC.

In the first quarter of 2013, an aggregate of 334,534 Series A Warrants were exercised. For the exercise of these warrants, we issued 334,534 shares of our common stock and received gross proceeds of approximately $468,000.