Loss per Share (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Shares Underlying Convertible Senior Secured Notes
Loss Per Share
Common stock equivalents excluded in the calculation of diluted loss per share	6,219,782
Series A Preferred Stock
Loss Per Share
Common stock equivalents excluded in the calculation of diluted loss per share		4,049,863	12,249,998
Warrants to purchase Series A Preferred Stock/Common Stock
Loss Per Share
Common stock equivalents excluded in the calculation of diluted loss per share	13,388	21,090	143,749
Stock Options, Stock Appreciation Rights, and Non-vested Stock Options
Loss Per Share
Common stock equivalents excluded in the calculation of diluted loss per share	151,737	256,939	598,109