Net Loss Attributable to Common Stockholders - Schedule of Net Income Attributable to Common Stockholders (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share Basic [Line Items]
Net loss		$ (1,675,350)	$ (9,483,241)	$ (6,491,074)	$ (20,892,267)
Net loss attributable to common stockholders		$ (1,675,350)	(12,380,255)	$ (6,491,074)	(30,636,971)
Series B and Series C Preferred Stock
Earnings Per Share Basic [Line Items]
Preferred stock dividends on Series B and Series C	[1]		$ (2,897,014)		$ (9,744,704)

[1] See Note 7 for further detail.