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Fair Value Measurements (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Liabilities:
Derivative liabilities related to warrants	$ 6,281,284	$ 8,765,628
Recurring basis \| Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Assets:
Money market fund	27,000,044
Recurring basis \| Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liabilities related to warrants	6,281,284	8,765,628
Recurring basis \| Balance at the end of the period
Liabilities:
Derivative liabilities related to warrants	6,281,284	8,765,628
Assets:
Money market fund	$ 27,000,044

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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