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Warrant liability (Details Textual) (USD $)	3 Months Ended	6 Months Ended				1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2012	Jun. 30, 2012	May 17, 2012	Feb. 08, 2012	Feb. 08, 2012 Warrant Equity Component [Member]	Feb. 28, 2012 Warrant Liability Component [Member]	Mar. 31, 2012 Warrant Liability Component [Member]	Jun. 30, 2012 Warrant Liability Component [Member]	Feb. 08, 2012 Warrant Liability Component [Member]
Warrant Liability (Textual) [Abstract]
Warrants Issued				21,562,500	16,145,833				5,416,667
Fair Value Adjustment (loss) of Warrant Liability		$ 3,000,000					$ 284,000
Fair Value of Warrant Liability	$ 7,900,000							$ 4,900,000	$ 7,600,000
Fair Value Assumption Expected Dividend Rate	0.00							0.00	0.00
Fair Value Assumption Risk Free Interest Rate	0.0059		0.0018					0.0041	0.0059
Fair value assumption expected volatility rate	93.00%							75.70%	93.00%
Fair value assumption contractual term	4 years					4 years		3 years 7 months 6 days
Warrant Liability (Additional Textual) [Abstract]
Rate at which warrants are exercisable				2.40
Warrants representing common stock		60

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- Definition

Fair value assumption expected dividend rate.

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Fair value assumption expected volatility rate.

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Fair value assumption risk free interest rate.

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Units sold warrants exercised.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

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- Definition

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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Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities.

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Adjustment to the amount at which a liability incurred or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale.

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