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Income taxes (Schedule of Deferred Tax Assets) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 9,902,000	$ 8,863,000
Accrued expenses and other	200,000	142,000
Stock compensation	1,014,000	745,000
Depreciation	(516,000)	(661,000)
Deferred tax assets and liabilties, net, before valuation allowance	10,600,000	9,089,000
Valuation allowance	(10,600,000)	(9,089,000)
Net deferred tax asset	$ 0	$ 0

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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