Summary of Significant Accounting Policies (Details 1) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net loss	$ 576,864	$ (2,265,599)	$ (5,207,293)	$ (4,380,445)	$ (2,346,276)	$ (3,568,051)	$ (6,620,586)	$ (2,449,408)	$ (10,932,590)	$ (14,984,321)	$ (23,368,283)
Preferred Stock Dividends and Other Adjustments [Abstract]
Less: Preferred stock dividends									216,379	0	0
Less: Accretion to redemption value of Series A preferred stock									127,504	0	0
Net loss attributable to common stockholders									$ (11,276,473)	$ (14,984,321)	$ (23,368,283)
Denominator:
Weighted average basic shares outstanding (in shares)									47,979,467	47,408,995	46,648,928
Effect of dilutive securities:
Stock options and restricted stock									0	0	0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock									0	0	0
Weighted average diluted shares outstanding (in shares)									47,979,467	47,408,995	46,648,928
EPS:
Basic net loss per share attributable to common stockholders (in dollars per share)	$ 0.01	$ (0.05)	$ (0.11)	$ (0.09)	$ (0.05)	$ (0.08)	$ (0.14)	$ (0.05)	$ (0.24)	$ (0.32)	$ (0.50)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ 0.01	$ (0.05)	$ (0.11)	$ (0.09)	$ (0.05)	$ (0.08)	$ (0.14)	$ (0.05)	$ (0.24)	$ (0.32)	$ (0.50)