Significant accounting policies (Tables)

9 Months Ended

Sep. 30, 2012

Significant accounting policies [Abstract]

Computation of basic and diluted net loss per share

The following table sets forth the computation of basic and diluted net loss per share:

	Three months ended September 30,							Nine months ended September 30,
		2012			2011			2012			2011
Net loss		$	(4,219,372	)	$	(1,765,723	)	$	(6,057,092	)	$	(7,616,791	)
Denominator for basic earnings per share - weighted average shares			84,493,164			73,767,674			84,091,014			72,082,605
Effect of dilutive securities: Stock options and warrants outstanding and convertible debt (a)			—			—			—			—
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities			84,493,164			73,767,674			84,091,014			72,082,605
Loss per common share - basic and diluted		$	(0.05	)	$	(0.02	)	$	(0.07	)	$	(0.11	)

Summary of antidilutive securities

(a)   Securities outstanding that were excluded from the computation, because they would have been anti-dilutive are as follows:

	September 30, 2012	September 30, 2011
Outstanding Stock Options	12,642,833	10,355,000
Outstanding Warrants	3,241,668	8,096,417
Convertible Debt, promissory notes	5,313,133	—
Convertible Line of Credit with Related Party	1,391,524	1,300,000
Convertible Debt, Acquisition	—	1,250,000
	22,589,158	21,001,417