Loss per Common Share Applicable to Common Stockholders (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Loss Per Common Share Applicable To Common Stockholders Details
Net loss	$ (1,687,223)	$ (2,960,122)	$ (5,810,495)	$ (7,181,174)
Preferred stock dividend accretion	325,367	303,553	959,409	895,087
Net loss applicable to common stockholders	$ (2,012,590)	$ (3,263,675)	$ (6,769,904)	$ (8,076,261)
Weighted-average shares outstanding, net of unvested restricted common shares - used to compute basic and diluted loss per share applicable to common stockholders	19,283,787	17,471,529	19,251,789	14,762,899