Fair Value Measurements (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair value measurements
Derivative liabilities related to Warrants	$ 8,765,628	$ 3,840,644
Recurring basis \| Significant Unobservable Inputs (Level 3)
Fair value measurements
Derivative liabilities related to Warrants	8,765,628	3,840,644
Recurring basis \| Balance at the end of the period
Fair value measurements
Derivative liabilities related to Warrants	$ 8,765,628	$ 3,840,644

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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+ Details