Significant accounting policies (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Accounts Receivable [Abstract]
Allowance for doubtful accounts	$ 53,000				$ 53,000				$ 20,000
Provision for doubtful accounts					51,000
Accounts receivable charge-offs					18,000
Revenue Recognition [Abstract]
Net sales returns provision	107,000		94,000		146,000		137,000
Provision charges	26,000		9,000		26,000		102,000
Fair value of financial instruments [Abstract]
Fair value of short term and long term convertible debt	5,286,000				5,286,000
Fair value of warrants issued in conjunction with placement fees	11,000				11,000
Computation of basic and diluted net loss per share [Abstract]
Net loss	$ (744,069)		$ (2,503,505)		$ (1,837,721)		$ (5,851,067)
Denominator for basic earnings per share - weighted average shares (in shares)	79,952,542		71,819,017		77,416,073		71,098,976
Effect of dilutive securities: Stock options and warrants outstanding and convertible debt (in shares)	0	[1]	0	[1]	0	[1]	0	[1]
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares)	79,952,542		71,819,017		77,416,073		71,098,976
Loss per common share - basic and diluted (in dollars per share)	$ (0.01)		$ (0.03)		$ (0.02)		$ (0.08)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)					28,189,945		21,008,584
Outstanding Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)					12,794,250		10,434,667
Outstanding Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)					7,763,817		8,023,917
Convertible Debt, promissory notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)					5,186,933		0
Convertible Line of Credit with Related Party [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)					1,375,137		1,300,000
Convertible Debt, Acquisition [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)					1,069,808		1,250,000

[1] Securities outstanding that were excluded from the computation, because they would have been anti-dilutive are as follows: June 30, 2012 June 30, 2011 Outstanding Stock Options 12,794,250 10,434,667 Outstanding Warrants 7,763,817 8,023,917 Convertible Debt, promissory notes 5,186,933 - Convertible Line of Credit with Related Party 1,375,137 1,300,000 Convertible Debt, Acquisition 1,069,808 1,250,000 28,189,945 21,008,584