Net Income (loss) Per Share (Details) (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, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Computation of basic and diluted net loss per share [Abstract]
Net income (loss)	$ (1,426,938)	$ (307,118)	$ (757,389)	$ (1,620,408)	$ (1,605,283)	$ (4,219,372)	$ (744,069)	$ (1,093,652)	$ (2,577,196)	$ (1,765,723)	$ (2,503,505)	$ (3,347,562)	$ (4,111,853)	$ (7,662,376)	$ (10,193,986)
Denominator for basic earnings per share - weighted average shares													96,285,504	81,646,295	72,450,337
Effect of dilutive securities: Stock options and warrants outstanding and convertible debt (in shares)													0	0	0
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities													96,285,504	81,646,295	72,450,337
Income (loss) per common share - basic and diluted (in dollars per share)	$ (0.01)	$ 0.00	$ (0.01)	$ (0.02)	$ (0.01)	$ (0.05)	$ (0.01)	$ (0.01)	$ (0.04)	$ (0.02)	$ (0.03)	$ (0.05)	$ (0.04)	$ (0.09)	$ (0.14)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)													16,660,776	22,056,948	27,372,173
Outstanding Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)													15,375,960	13,614,135	10,333,583
Outstanding Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)													1,284,816	3,129,168	9,388,817
Convertible Debt, promissory notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)													0	5,313,645	5,007,732
Convertible Line of Credit with Related Party
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)													0	0	1,342,726
Convertible Debt, Acquisition
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)													0	0	1,299,315