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Warrant Liability - Assumptions Used for Black-Scholes Model (Detail) | 6 Months Ended
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Jun. 30, 2016
Class of Warrant or Right [Line Items] |
Expected dividend yield | 0.00%
December 2011 Financing [Member] | Series A Warrants [Member] |
Class of Warrant or Right [Line Items] |
Risk-free interest rate per year | 0.26%
Expected volatility per year | 269.60%
Expected dividend yield | 0.00%
Expected life (years) | 6 months
March 2016 Financing [Member] | Series A Warrants [Member] |
Class of Warrant or Right [Line Items] |
Risk-free interest rate per year | 0.68%
Expected volatility per year | 155.80%
Expected dividend yield | 0.00%
Expected life (years) | 1 year 8 months 12 days
March 2016 Financing [Member] | Series B Warrants [Member] |
Class of Warrant or Right [Line Items] |
Risk-free interest rate per year | 1.26%
Expected volatility per year | 108.20%
Expected dividend yield | 0.00%
Expected life (years) | 5 years 8 months 12 days

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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