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Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative liabilities	$ 2,689,348us-gaap_DerivativeLiabilitiesCurrent	$ 2,226,445us-gaap_DerivativeLiabilitiesCurrent
Common shares linked to derivative liabilities	4,737,104	4,737,104
Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities	2,594,444	2,115,318
Common shares linked to derivative liabilities	3,174,604	3,174,604
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	94,904	111,127
Common shares linked to derivative liabilities	1,562,500	1,562,500
Senior Convertible Notes [Member] \| Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	94,904	111,127
Common shares linked to derivative liabilities	1,562,500	1,562,500
2014 Convertible Promissory Notes [Member] \| Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities	$ 2,594,444	$ 2,115,318
Common shares linked to derivative liabilities	3,174,604	3,174,604

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 within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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