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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
Class of Stock [Line Items]
Share reserved for share-based compensation	36,438,871us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Outstanding Warrants [Member]
Class of Stock [Line Items]
Share reserved for share-based compensation	23,078,181us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember
Stock Compensation Plan [Member]
Class of Stock [Line Items]
Share reserved for share-based compensation	13,360,690us-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

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