Equivalent shares were excluded from the calculation of diluted loss per share (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Equivalent shares were excluded from the calculation of diluted loss per share
Options to purchase common stock	3,425,000	685,000
Warrants	2,790,180	1,981,661
Restricted stock	122,667	122,667