Summary of Significant Accounting Policies (Details 3) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net loss	$ (2,295,014)	$ (2,922,694)	$ (2,998,645)	$ 4,934,176	$ (2,827,016)	$ (3,545,218)	$ 1,023,512	$ (3,104,078)	$ (1,929,361)	$ (7,211,821)	$ (10,932,590)
Preferred Stock Dividends and Other Adjustments [Abstract]
Less: Series A redeemable convertible preferred stock dividends									765,203	747,616	216,379
Less: Accretion to redemption value of Series A redeemable convertible preferred stock									587,613	493,363	127,504
Net loss attributable to common stockholders									$ (3,282,177)	$ (8,452,800)	$ (11,276,473)
Denominator:
Weighted average basic shares outstanding (in shares)									41,093,644	46,265,225	47,979,467
Effect of dilutive securities:
Stock options and restricted stock									0	0	0
Series A redeemable convertible preferred stock									0	0	0
Weighted average diluted shares outstanding (in shares)									41,093,644	46,265,225	47,979,467
EPS:
Basic net loss per share attributable to common stockholders (in dollars per share)	$ (0.06)	$ (0.07)	$ (0.07)	$ 0.12	$ (0.06)	$ (0.08)	$ 0.02	$ (0.06)	$ (0.08)	$ (0.18)	$ (0.24)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.06)	$ (0.07)	$ (0.07)	$ 0.10	$ (0.06)	$ (0.08)	$ 0.02	$ (0.06)	$ (0.08)	$ (0.18)	$ (0.24)