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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Derivative [Line Items] |  |  |  |
Derivative income (expense) | $ 305,841 | $ 640,153 | $ 676,820 | $ 1,342,991
Redemptions of Senior Convertible Notes |  | 230,300 |  | 863,651
Total derivative income (expense) | 305,841 | 870,453 | 676,820 | 2,206,642
Senior Convertible Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative income (expense) |  | 202,034 | 47,243 | 244,303
2014 Share Purchase Option [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative income (expense) | (153,175) |  | (153,175) |
Warrant Derivatives [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative income (expense) | $ 459,016 | $ 438,119 | $ 782,752 | $ 1,098,688

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 + Details
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