Sales of Common Stock	12 Months Ended
Dec. 31, 2012
Sales of Common Stock [Abstract]
Sales of Common Stock	Note 12 - Sales of Common Stock In 2012, the Company completed two separate offerings to sell over 12 million and 10 million shares of common stock. In October 2012, the Company sold 12,385,321 shares of its common stock to RA Capital Management, LLC ("RA Capital"), Camber Capital Management LLC and Ayer Capital Management LLC at a price of $2.18 per share, resulting in approximately $27 million in net proceeds. In May 2012, the Company sold 10,000,000 shares of its common stock to RA Capital at a price of $1.22 per share, resulting in approximately $12.2 million in net proceeds. In both cases, the shares were offered under an effective shelf registration statement previously filed with the Securities and Exchange Commission ("SEC"). The Board of Directors of the Company (the "Board") has appointed a standing Finance Committee (the "Committee") to assist the Board with its responsibilities to monitor, provide advice to senior management of the Company and approve all capital raising activities. The Committee has been authorized by the Board to approve all At Market Issuance sales transactions. In doing so, the Committee sets the amount of shares to be sold, the period of time during which such sales may occur and the minimum sales price per share. In October 2012, the Company entered into an At Market Issuance Sales Agreement ("2012 Sales Agreement"), under which the Company may sell an aggregate of $50 million in gross proceeds of its common stock. This agreement replaces the previous and terminated At Market Issuance Sales Agreement entered in March 2010 ("2010 Sales Agreement"), which also allowed for the sale of an aggregate of $50 million in gross proceeds of its common stock, but had recently met its limitation of sales of shares. The shares of common stock are being offered pursuant to a shelf registration statement filed with the SEC. During 2012, the Company sold 8,442,025 shares at sales prices ranging from of $1.31 ─ $2.18 per share, resulting in $14.0 million in net proceeds; this amount excludes $0.8 million received in early 2012 for 0.7 million shares traded in late December 2011. During 2011, the Company sold 6,001,841 shares at sales prices ranging from $1.25 ─ $2.75 per share, resulting in $11.8 million in net proceeds (with $0.8 million received in early 2012 for 0.7 million shares traded in late December 2011). During 2010, the Company sold 10,513,849 shares at sales prices ranging from $2.10 ─ $2.55 per share, resulting in $23.1 million in net proceeds. The Company sold a total 24,957,715 shares of its common stock and received gross proceeds of $49.9 million under the 2010 Sales Agreement.

Note 12 - Sales of Common Stock

In 2012, the Company completed two separate offerings to sell over 12 million and 10 million shares of common stock. In October 2012, the Company sold 12,385,321 shares of its common stock to RA Capital Management, LLC ("RA Capital"), Camber Capital Management LLC and Ayer Capital Management LLC at a price of $2.18 per share, resulting in approximately $27 million in net proceeds. In May 2012, the Company sold 10,000,000 shares of its common stock to RA Capital at a price of $1.22 per share, resulting in approximately $12.2 million in net proceeds. In both cases, the shares were offered under an effective shelf registration statement previously filed with the Securities and Exchange Commission ("SEC").

The Board of Directors of the Company (the "Board") has appointed a standing Finance Committee (the "Committee") to assist the Board with its responsibilities to monitor, provide advice to senior management of the Company and approve all capital raising activities. The Committee has been authorized by the Board to approve all At Market Issuance sales transactions. In doing so, the Committee sets the amount of shares to be sold, the period of time during which such sales may occur and the minimum sales price per share. In October 2012, the Company entered into an At Market Issuance Sales Agreement ("2012 Sales Agreement"), under which the Company may sell an aggregate of $50 million in gross proceeds of its common stock. This agreement replaces the previous and terminated At Market Issuance Sales Agreement entered in March 2010 ("2010 Sales Agreement"), which also allowed for the sale of an aggregate of $50 million in gross proceeds of its common stock, but had recently met its limitation of sales of shares. The shares of common stock are being offered pursuant to a shelf registration statement filed with the SEC. During 2012, the Company sold 8,442,025 shares at sales prices ranging from of $1.31 ─ $2.18 per share, resulting in $14.0 million in net proceeds; this amount excludes $0.8 million received in early 2012 for 0.7 million shares traded in late December 2011. During 2011, the Company sold 6,001,841 shares at sales prices ranging from $1.25 ─ $2.75 per share, resulting in $11.8 million in net proceeds (with $0.8 million received in early 2012 for 0.7 million shares traded in late December 2011). During 2010, the Company sold 10,513,849 shares at sales prices ranging from $2.10 ─ $2.55 per share, resulting in $23.1 million in net proceeds. The Company sold a total 24,957,715 shares of its common stock and received gross proceeds of $49.9 million under the 2010 Sales Agreement.