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Intangible Assets - Carrying Value of Intangibles Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Total identifiable intangible assets	$ 1,870us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	$ 1,870us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
CERE-110 for the treatment of Alzheimer's disease ("IPR&D") [Member]
Finite-Lived Intangible Assets [Line Items]
Total identifiable intangible assets	1,640us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = sgmo_CereOneHundredAndTenTreatmentOfAlzheimerDiseaseMember	1,640us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = sgmo_CereOneHundredAndTenTreatmentOfAlzheimerDiseaseMember
CERE-120 for the treatment of Parkinson's disease ("IPR&D") [Member]
Finite-Lived Intangible Assets [Line Items]
Total identifiable intangible assets	$ 230us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = sgmo_CereOneHundredAndTwentyTreatmentOfParkinsonDiseaseMember	$ 230us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = sgmo_CereOneHundredAndTwentyTreatmentOfParkinsonDiseaseMember

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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