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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 4, 2013, the Company completed a follow-on offering of its common stock. The Company sold 4,600,000 shares of common stock at a price of $11.40 per share raising net proceeds of $49.0 million. On February 22, 2013, the Company’s Board of Directors approved, subject to shareholder approval, an increase in the authorized number of shares of common stock from 38,833,334 shares to 75,000,000 shares. On February 22, 2013, the Company’s Board of Directors approved, subject to shareholder approval, the increase in shares reserved under the 2010 Non-Employee Directors' Stock Award Plan from 238,095 shares to 400,000 shares of common stock. Additionally, on February 22, 2013, the Company’s Board of Directors approved, subject to shareholder approval, the increase in shares reserved under the 2010 Employee Stock Purchase Plan from 214,285 shares to 400,000 shares of common stock.