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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Quoted market price on valuation date | $ 2.5 |  |
Level 3 [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 83.60% | 57.00% | 59.90%
Risk free rates using zero coupon US Treasury Security rates | 0.04% | 0.02% | 0.04%
Level 3 [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Range of market volatilities | 106.30% | 79.70% | 73.90%
Risk free rates using zero coupon US Treasury Security rates | 0.33% | 0.58% | 0.67%
Level 3 [Member] | Derivative Financial Instruments, Assets [Member] |  |  |
Derivative [Line Items] |  |  |
Linked common shares | 1,562,500 | 1,562,500 | 1,562,500
Quoted market price on valuation date | $ 0.36 | $ 0.91 | $ 0.93
Contractual exercise rate | $ 3.60 | $ 3.60 | $ 3.60
Term (years) | 1 year 7 months 10 days | 2 years 7 months 10 days | 2 years 4 months 24 days

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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Agreed upon price for the exchange of the underlying asset. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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