Summary of Significant Accounting Policies (Details 3) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net loss	$ (2,827,016)	$ (3,545,218)	$ 1,023,512	$ (3,104,078)	$ 576,864	$ (2,265,599)	$ (5,207,293)	$ (4,380,445)	$ (7,211,821)	$ (10,932,590)	$ (14,984,321)
Preferred Stock Dividends and Other Adjustments [Abstract]
Less: Series A redeemable convertible preferred stock dividends									747,616	216,379	0
Less: Accretion to redemption value of Series A redeemable convertible preferred stock									493,363	127,504	0
Net loss attributable to common stockholders									$ (8,452,800)	$ (11,276,473)	$ (14,984,321)
Denominator:
Weighted average basic shares outstanding (in shares)									46,265,225	47,979,467	47,408,995
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)									46,265,225	47,979,467	47,408,995
EPS:
Basic net loss per share attributable to common stockholders (in dollars per share)	$ (0.06)	$ (0.08)	$ 0.02	$ (0.06)	$ 0.01	$ (0.05)	$ (0.11)	$ (0.09)	$ (0.18)	$ (0.24)	$ (0.32)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.06)	$ (0.08)	$ 0.02	$ (0.06)	$ 0.01	$ (0.05)	$ (0.11)	$ (0.09)	$ (0.18)	$ (0.24)	$ (0.32)