Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Detail) - $ / shares	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Quoted market price on valuation date	$ 2.50	$ 2.50
Level 3 [Member] \| Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Linked common shares	130,208	130,208
Quoted market price on valuation date	$ 3.24	$ 11.16
Contractual exercise rate	$ 43.20	$ 43.20
Term (years)	1 year 4 months 6 days	2 years 4 months 24 days
Level 3 [Member] \| Minimum [Member] \| Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Range of market volatilities	92.90%	59.90%
Risk free rates using zero coupon US Treasury Security rates	0.16%	0.04%
Level 3 [Member] \| Maximum [Member] \| Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Range of market volatilities	113.20%	73.90%
Risk free rates using zero coupon US Treasury Security rates	0.65%	0.67%

Fair Value Assumptions Linked Common Shares

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Fair value assumptions quoted price.

+ References

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Risk free rates using zero coupon country treasury security range of rates.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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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

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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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