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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
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   $ 200,000sgmo_CollaborationAgreementRelatedCostsAndExpenses $ 300,000sgmo_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 6,000,000sgmo_OneTimeLicenseFeeEarned
/ us-gaap_CounterpartyNameAxis
= sgmo_DowAgroSciencesMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= us-gaap_LicenseAgreementTermsMember
   
Royalty revenues 2,300,000us-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 4,000,000sgmo_MilestonePaymentAndRoyaltyRevenueOfPreviousAgreement
/ us-gaap_CounterpartyNameAxis
= sgmo_DowAgroSciencesMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= us-gaap_LicenseAgreementTermsMember
   
Fee due 25,300,000sgmo_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   0sgmo_CollaborationAgreementRelatedCostsAndExpenses
/ us-gaap_CounterpartyNameAxis
= sgmo_DowAgroSciencesMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= us-gaap_LicenseAgreementTermsMember
0sgmo_CollaborationAgreementRelatedCostsAndExpenses
/ us-gaap_CounterpartyNameAxis
= sgmo_DowAgroSciencesMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= us-gaap_LicenseAgreementTermsMember
Revenue attributable to research and development   0us-gaap_LicensesRevenue
/ us-gaap_CounterpartyNameAxis
= sgmo_DowAgroSciencesMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= us-gaap_LicenseAgreementTermsMember
0us-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 250,000sgmo_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 $ 3,000,000sgmo_AnnualFeesRelatedToAgreement
/ us-gaap_CounterpartyNameAxis
= sgmo_DowAgroSciencesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= us-gaap_LicenseAgreementTermsMember