Preferred Stock Convertible Redeemable Series E Preferred Stock (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Net proceeds from issuance of capital stock	$ 36,471,269	$ 16,710,645	$ 58,736,165