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Acquisition of Ceregene - Summary of Assets, Estimated Fair Values (Detail) (Ceregene, Inc. [Member], USD $) In Thousands, unless otherwise specified	Oct. 31, 2013
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1,870us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
CERE-110 for the treatment of Alzheimer's disease ("IPR&D") [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	1,640us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sgmo_CereOneHundredAndTenTreatmentOfAlzheimerDiseaseMember
CERE-120 for the treatment of Parkinson's disease ("IPR&D") [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 230us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sgmo_CereOneHundredAndTwentyTreatmentOfParkinsonDiseaseMember

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X

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

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Balance Type:	debit
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