Stock Offering	12 Months Ended
Dec. 31, 2013
Stock Offering [Abstract]
Stock offering	Stock Offering In April 2011, the Company filed a shelf registration statement on Form S-3 with the SEC to, from time to time, sell up to an aggregate of $125 million of its common stock, warrants or debt securities. During the quarter ended March 31, 2012, the Company sold a total of 572,510 shares of its common stock for net proceeds of $10.3 million pursuant an At-the-Market Equity Offering Sales Agreement (“Sales Agreement”) with Citadel Securities LLC (“Citadel”) dated February 2012. No shares have been sold subsequent to the quarter ended March 31, 2012.

Stock Offering

In April 2011, the Company filed a shelf registration statement on Form S-3 with the SEC to, from time to time, sell up to an aggregate of $125 million of its common stock, warrants or debt securities. During the quarter ended March 31, 2012, the Company sold a total of 572,510 shares of its common stock for net proceeds of $10.3 million pursuant an At-the-Market Equity Offering Sales Agreement (“Sales Agreement”) with Citadel Securities LLC (“Citadel”) dated February 2012. No shares have been sold subsequent to the quarter ended March 31, 2012.