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Major Customers, Partnerships and Strategic Alliances - CHDI Foundation, Inc. - Additional Information (Detail) (CHDI Foundation, Inc. [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2011 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CHDI Foundation, Inc. [Member] |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Funds due under agreement | $ 1.3 sgmo_FundsDueUnderAgreement / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember |  |  |
Agreement date |  | Apr. 30, 2011 |  |
Agreement to receive | 1 year |  |  |
Contractual agreement termination date |  | Aug. 31, 2012 |  |
Funds due under agreement as per amendment |  |  | 1.3 sgmo_PostAmendmentFundsDueUnderAgreement / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember | 2.1 sgmo_PostAmendmentFundsDueUnderAgreement / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember
Collaboration agreement related costs and expenses |  | 0 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember | 0 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember | 1.1 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember
Revenues under the agreement |  | $ 0 sgmo_ResearchGrantRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember | $ 0 sgmo_ResearchGrantRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember | $ 1.1 sgmo_ResearchGrantRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = sgmo_ChdiFoundationIncMember

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- Details
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