Summary of Significant Accounting Policies (EPS) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) segment $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Numerator:
Net loss | $	$ (49,724,054)	$ (35,958,979)
Less: income from change in fair value of warrant liability | $	(191,150)	(418,198)
Numerator for diluted net loss per common share | $	$ (49,915,204)	$ (36,377,177)
Denominator
Basic weighted average common shares outstanding (in shares)	23,692,327	22,290,069
Dilutive common shares from assumed warrant exercises (in shares)	38,048	61,620
Diluted weighted average shares of common stock outstanding (in shares)	23,730,375	22,351,689
Diluted net loss per share of common stock (in dollars per share) | $ / shares	$ (2.10)	$ (1.63)
Shares excluded from the computation of diluted weighted average shares outstanding	11,731,064	10,431,141
Segment Information
Number of operating segment | segment	1
Convertible preferred stock
Denominator
Shares excluded from the computation of diluted weighted average shares outstanding	23,747	23,747
Warrants
Denominator
Shares excluded from the computation of diluted weighted average shares outstanding	3,649,046	3,270,363
Restricted stock awards
Denominator
Shares excluded from the computation of diluted weighted average shares outstanding	8,058,271	7,137,031