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Major Customers, Partnerships and Strategic Alliances - California Institute for Regenerative Medicine - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | May 31, 2014 | Oct. 31, 2009 | May 31, 2013
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Research grants | $ 820,000 us-gaap_RevenueFromGrants | $ 548,000 us-gaap_RevenueFromGrants |  |  |
California Institute for Regenerative Medicine [Member] |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Funds due under the agreement |  |  | 5,600,000 sgmo_GrantFundingAmount / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember | 14,500,000 sgmo_GrantFundingAmount / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember |
Expected amount to be received for research and development |  |  |  | 5,200,000 sgmo_ExpectedRevenueToBeReceivedForResearchAndDevelopment / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember |
Agreement to receive |  |  | 4 years | 4 years |
Agreement date | Oct. 31, 2009 |  |  |  |
Research grants | 0 us-gaap_RevenueFromGrants / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember | 0 us-gaap_RevenueFromGrants / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember |  |  |
Collaboration agreement related costs and expenses | 300,000 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember | 0 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember |  |  |
California Institute for Regenerative Medicine [Member] | Beta-thalassemia [Member] |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Funds due under the agreement |  |  |  |  | 6,400,000 sgmo_GrantFundingAmount / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = sgmo_BetaThalassemiaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember
Agreement to receive |  |  |  |  | 4 years
Research grants | 700,000 us-gaap_RevenueFromGrants / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = sgmo_BetaThalassemiaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember | 400,000 us-gaap_RevenueFromGrants / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = sgmo_BetaThalassemiaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember |  |  |
Collaboration agreement related costs and expenses | 700,000 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = sgmo_BetaThalassemiaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember | 400,000 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = sgmo_BetaThalassemiaMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_CaliforniaInstituteForRegenerativeMedicineMember |  |  |
License agreement terms [Member] |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Research grants | 0 us-gaap_RevenueFromGrants / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember | 0 us-gaap_RevenueFromGrants / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |  |
Collaboration agreement related costs and expenses | $ 200,000 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember | $ 300,000 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |  |

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