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Acquisition of Ceregene - Additional Information (Detail) (USD $)	1 Months Ended	15 Months Ended
	Oct. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 1,585,000us-gaap_Goodwill	$ 1,585,000us-gaap_Goodwill
Ceregene, Inc. [Member]
Business Acquisition [Line Items]
Common stock, transferred, shares	100,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember
Sangamo shares of common stock	1,200,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember
Purchase price deposited in escrow account	300,000us-gaap_EscrowDepositDisbursementsRelatedToPropertyAcquisition1 / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember
Estimated fair values of in-process research and development	1,900,000us-gaap_ResearchAndDevelopmentInProcess / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember
Goodwill	1,585,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember
Changes to the assets acquired or liabilities assumed, including goodwill		0sgmo_ChangeInBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember
Fair value liability for contingent consideration recognized	$ 1,500,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember	$ 1,800,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = sgmo_CeregeneIncMember

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