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Major Customers, Partnerships and Strategic Alliances - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended
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Jan. 31, 2014 Program Company | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 Product | Jun. 30, 2012 Targets | Jan. 31, 2012 Targets | Sep. 30, 2014
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Number of companies jointly conducting research program | 2 sgmo_NumberOfCompaniesJointlyConductingResearchProgram |  |  |  |  |  |  |
Number of research programs | 2 sgmo_NumberOfResearchProgram |  |  |  |  |  |  |
Research and development |  | $ 56,744,000 us-gaap_ResearchAndDevelopmentExpense | $ 36,979,000 us-gaap_ResearchAndDevelopmentExpense | $ 31,709,000 us-gaap_ResearchAndDevelopmentExpense |  |  |  |
Biogen [Member] |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Revenues under agreement | 20,000,000 us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember |  |  |  |  |  |  |
Potential amount eligible to receive for certain milestones | 126,300,000 sgmo_AggregateAdditionalRevenueRecognitionMilestoneMethodRevenueAchieved / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember |  |  |  |  |  |  |
Potential amount to be funded for achievement of specified commercialized and sales milestones | 167,500,000 sgmo_AggregateAdditionalRevenueRecognitionMilestoneMethodRevenueEligibleToReceive / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember |  |  |  |  |  |  |
Milestone revenue receivable | 293,800,000 sgmo_MilestoneRevenueReceivable / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember |  |  |  |  |  |  |
Number of licensed products approved under agreement |  |  |  |  | 0 sgmo_NumberOfLicensedProducts / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember |  |  |
Research program to develop laboratory research reagents |  | 40 months |  |  |  |  |  |
Deferred revenue |  | 14,900,000 us-gaap_DeferredRevenue / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember |  |  | 14,900,000 us-gaap_DeferredRevenue / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember |  |  |
Biogen [Member] | Beta-thalassemia [Member] |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Milestone revenue receivable | 7,500,000 sgmo_MilestoneRevenueReceivable / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_BetaThalassemiaMember |  |  |  |  |  |  |
Research and development |  | 5,200,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_BetaThalassemiaMember |  |  |  |  |  |
Biogen [Member] | Sickle cell disease [Member] |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Milestone revenue receivable | 7,500,000 sgmo_MilestoneRevenueReceivable / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_SickleCellDiseaseMember |  |  |  |  |  |  |
Biogen [Member] | Other Projects |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Research and development |  | 3,500,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_CounterpartyNameAxis = sgmo_BiogenMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_OtherProjectsMember |  |  |  |  |  |
Shire AG [Member] |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Revenues under agreement |  |  |  |  |  |  | 13,000,000 us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |
Potential amount to be funded for achievement of specified commercialized and sales milestones |  |  |  |  |  |  | 180,000,000 sgmo_AggregateAdditionalRevenueRecognitionMilestoneMethodRevenueEligibleToReceive / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |
Milestone revenue receivable |  |  |  |  |  |  | 33,500,000 sgmo_MilestoneRevenueReceivable / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |
Research program to develop laboratory research reagents |  | 6 years |  |  |  |  |  |
Deferred revenue |  | 6,800,000 us-gaap_DeferredRevenue / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |  | 6,800,000 us-gaap_DeferredRevenue / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |  |
Research and development |  | 21,100,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember | 14,200,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember | 7,700,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |  |  |
Aggregate number of gene targets |  |  |  |  |  |  | 7 sgmo_AggregateNumberOfGeneTargets / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |
Number of initial gene targets |  |  |  |  |  |  | 4 sgmo_NumberOfInitialGeneTargets / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |
Number of gene targets |  |  |  |  |  | 5 sgmo_NumberOfGeneTargets / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |
Number of additional gene targets |  |  |  |  |  | 2 sgmo_NumberOfAdditionalGeneTargets / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |
IND or CTA submission amount |  |  |  |  |  |  | 8,500,000 sgmo_AggregateAdditionalRevenueRecognitionMilestoneMethodRevenueToBeRecognizedOnAcceptanceOfApplication / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |
Potential amount to be funded for certain Shire milestones |  |  |  |  |  |  | 213,500,000 sgmo_AggregateAdditionalRevenueRecognitionMilestoneMethodRevenueToBeRecognized / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |
Milestone payment |  | 1,000,000 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |  |  |  |  | 1,000,000 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember
Number of products approved |  | 0 sgmo_CollaborationAndLicenseAgreementsNumberOfProductsApprovedUnderAgreement / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |  |  |  |  |
Royalty revenues |  | $ 0 us-gaap_RoyaltyRevenue / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember |  |  |  |  |  |

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