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Major Customers, Partnerships and Strategic Alliances - Agreement with Dow AgroSciences in Plant Agriculture - Additional Information (Detail) (Dow Agro Sciences [Member], License agreement terms [Member], USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2005	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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
Royalty revenues	2,300,000us-gaap_RoyaltyRevenue
Percentage of royalties to be received from sublicensing	25.00%sgmo_PercentageOfRoyaltiesToBeReceivedFromSublicensing
Previously agreed research, development and commercialization milestone payments, and royalties on sales of products	4,000,000sgmo_MilestonePaymentAndRoyaltyRevenueOfPreviousAgreement
Fee due	25,300,000sgmo_FeeDue
Minimum license annual fees specific reckoning period	11 years
Collaboration agreement related costs and expenses		0sgmo_CollaborationAgreementRelatedCostsAndExpenses	400,000sgmo_CollaborationAgreementRelatedCostsAndExpenses	600,000sgmo_CollaborationAgreementRelatedCostsAndExpenses
Revenue attributable to research and development		3,000,000us-gaap_LicensesRevenue	3,000,000us-gaap_LicensesRevenue	4,700,000us-gaap_LicensesRevenue
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
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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Article 5

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