Share-Based Payment Arrangements (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 1,466,183	$ 1,705,429	$ 4,614,769
Restricted stock and restricted stock units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	602,889	257,843	598,447
Restricted stock and restricted stock units | Directors, officers, and employees
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	602,889	257,843	584,959
Restricted stock and restricted stock units | Non-employee consultants
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 0	$ 0	$ 13,488