Black-Scholes Inputs to Warrant Liability Valuation (Detail) - $ / shares	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
2014 Offering
Stock Price	$ 0.88	$ 1.95
Exercise price	$ 2.04	$ 2.04
Expected volatility	72.03%	71.11%
Risk free interest rate	1.09%	1.51%
Expected Term	3 years 9 months	4 years 6 months
Dividends	0.00%	0.00%
2013 Offering
Stock Price	$ 0.88	$ 1.95
Exercise price	$ 2.00	$ 2.00
Expected volatility	72.80%	75.71%
Risk free interest rate	0.82%	1.24%
Expected Term	2 years 8 months	3 years 5 months
Dividends	0.00%	0.00%

Agreed upon price for the exchange of the underlying asset.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

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- Definition

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.

+ References

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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