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Fair Value Measurement - Roll Forward for Financial Assets and Liabilities Measured at Fair Value Using Significant Other Observable Inputs (Level 2) (Detail) (Fair Value, Measurements [Member], USD $) |  | 9 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 2013 Significant Other Observable Inputs Level 2 [Member] | Sep. 30, 2013 Significant Other Observable Inputs Level 2 [Member] Bond obligation [Member] | Sep. 30, 2013 Significant Other Observable Inputs Level 2 [Member] Warrant liabilities [Member] | Sep. 30, 2013 Significant Other Observable Inputs Level 2 [Member] Marketable securities [Member] | Dec. 31, 2012 Significant Other Observable Inputs Level 2 [Member] Marketable securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Marketable debt securities, Beginning Balance | $ 20,955,293 |  | $ 331,250 | $ 107,968 |  | $ 13,900,678
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1 |  |  |  |  | (13,900,678) |
Financial liabilities change included in earning fair value disclosure |  |  |  | (92,708) |  |
Financial liabilities change settled in earning fair value disclosure |  |  | (152,500) |  |  |
Marketable debt securities, ending Balance | $ 20,955,293 |  | $ 178,750 | $ 15,260 |  | $ 13,900,678

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- Definition Fair Value Measurement With Directly Or Indirectly Observable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings + References No definition available. + Details
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- Definition Fair Value Measurement With Directly Or Indirectly Observable Inputs Reconciliation Recurring Basis Liability Settlements + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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