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Major Customers, Partnerships and Strategic Alliances - Agreement with Dow AgroSciences in Plant Agriculture - Additional Information (Detail) (License agreement terms [Member], USD $) | 1 Months Ended | 3 Months Ended
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Oct. 31, 2005 | Mar. 31, 2015 | Mar. 31, 2014
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Collaboration agreement related costs and expenses |  | $ 200,000 sgmo_CollaborationAgreementRelatedCostsAndExpenses | $ 300,000 sgmo_CollaborationAgreementRelatedCostsAndExpenses
Dow Agro Sciences [Member] |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Research program to develop laboratory research reagents | 3 years |  |
One-time license fee earned on exercise of option | 6,000,000 sgmo_OneTimeLicenseFeeEarned / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |
Royalty revenues | 2,300,000 us-gaap_RoyaltyRevenue / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |
Percentage of royalties to be received from sublicensing | 25.00%sgmo_PercentageOfRoyaltiesToBeReceivedFromSublicensing / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |
Previously agreed research, development and commercialization milestone payments, and royalties on sales of products | 4,000,000 sgmo_MilestonePaymentAndRoyaltyRevenueOfPreviousAgreement / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |
Fee due | 25,300,000 sgmo_FeeDue / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |
Minimum license annual fees specific reckoning period | 11 years |  |
Collaboration agreement related costs and expenses |  | 0 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember | 0 sgmo_CollaborationAgreementRelatedCostsAndExpenses / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember
Revenue attributable to research and development |  | 0 us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember | 0 us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember
Dow Agro Sciences [Member] | Minimum [Member] |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Annual fees | 250,000 sgmo_AnnualFeesRelatedToAgreement / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |
Dow Agro Sciences [Member] | Maximum [Member] |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Annual fees | $ 3,000,000 sgmo_AnnualFeesRelatedToAgreement / us-gaap_CounterpartyNameAxis = sgmo_DowAgroSciencesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |

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