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Major Customers, Partnerships and Strategic Alliances - Juvenile Diabetes Research Foundation International - Additional Information (Detail) (Juvenile Diabetes Research Foundation International [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Mar. 31, 2012 | Jan. 31, 2010 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Juvenile Diabetes Research Foundation International [Member] |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Agreement date |  |  | Oct. 31, 2006 |  |
Grant funding amount maximum under amended agreement |  | $ 3.0 sgmo_GrantFundingAmountMaximumUnderAmendedAgreement / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_JuvenileDiabetesResearchFoundationInternationalMember |  |  |
Received for work performed under agreement | 0.8 sgmo_ProceedsReceivedForWorkPerformedUnderAgreement / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_JuvenileDiabetesResearchFoundationInternationalMember |  |  |  |
Revenues under the agreement |  |  | $ 0 sgmo_ResearchGrantRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_JuvenileDiabetesResearchFoundationInternationalMember | $ 0 sgmo_ResearchGrantRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_JuvenileDiabetesResearchFoundationInternationalMember | $ 0.8 sgmo_ResearchGrantRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_JuvenileDiabetesResearchFoundationInternationalMember

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- Details
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