Derivative Liability and Fair Value Measurements (Estimate the fair value of warrants outstanding) (Detail) (USD $)	0 Months Ended	12 Months Ended
Aug. 05, 2013	Dec. 31, 2014	Dec. 31, 2013
Value of warrants outstanding:
Fair value of warrants	9,067,283us-gaap_DerivativeLiabilities	10,734,196us-gaap_DerivativeLiabilities	12,035,816us-gaap_DerivativeLiabilities
Warrant [Member]
Assumptions for Pricing Model:
Risk-free interest rate			1.75%
Warrant [Member] \| Minimum [Member]
Assumptions for Pricing Model:
Expected term in years	4 years 7 months 13 days	3 years 5 months 19 days	4 years 2 months 12 days
Volatility range for years	61.00%	72.00%	56.00%
Risk-free interest rate	0.77%	0.93%
Warrant [Member] \| Maximum [Member]
Assumptions for Pricing Model:
Expected term in years	5 years	4 years 14 days	4 years 7 months 6 days
Volatility range for years	110.00%	81.00%	62.00%
Risk-free interest rate	1.41%	1.83%

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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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

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-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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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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