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Common Stock - Reserved Shares of Common Stock for Exercise of Options, Warrants and Other Contingent Issuances of Common Stock (Detail) | Dec. 31, 2014
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Class of Stock [Line Items] |
Share reserved for share-based compensation | 36,438,871 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Outstanding Warrants [Member] |
Class of Stock [Line Items] |
Share reserved for share-based compensation | 23,078,181 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember
Stock Compensation Plan [Member] |
Class of Stock [Line Items] |
Share reserved for share-based compensation | 13,360,690 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = us-gaap_StockCompensationPlanMember

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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