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Stock options and warrants (Other common stock purchase options and warrants) (Narrative) (Details) (USD $)	3 Months Ended					1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Nonqualified [Member]	Mar. 31, 2012 Nonqualified [Member]	Dec. 31, 2012 Nonqualified [Member]	Jun. 30, 2012 Nonqualified [Member] Public Offering [Member]	Jun. 30, 2012 Nonqualified [Member] Underwriter [Member]	Mar. 31, 2013 Nonqualified [Member] Non-compensatory Rights [Member]	Mar. 31, 2013 Nonqualified [Member] Compensatory Arrangements [Member]	Mar. 31, 2013 Nonqualified [Member] Investor Relations Firm [Member]	Mar. 31, 2012 Nonqualified [Member] Investor Relations Firm [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding			598,006		598,507
Share-based compensation, operating expense	$ 484,222	$ 221,996	$ 14,000	$ 29,000
Stock issued						1,220,000
Warrants, number of shares							305,000	572,505	25,501
Warrants, exercise price							2.50
Options granted
Options granted, exercise price
Vested and exercisable value										14,178	56,033
Unrecognized compensation expense			$ 8,000
Unrecognized compensation cost, recognition period			1 year

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The exercise price of each class of warrants or rights outstanding.

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The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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