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Employee Benefit Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]
Defined contribution plan, employer's matching contribution percent	50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Employers matching contribution percentage towards employees contribution	6.00%sgmo_EmployersMatchingContributionPercentageTowardsEmployeesContribution
Defined contribution plan, maximum employer's contribution per employee	$ 2,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount	$ 1,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Aggregate employers contributions to defined contribution plan	$ 200,000us-gaap_DefinedContributionPlanCostRecognized	$ 100,000us-gaap_DefinedContributionPlanCostRecognized	$ 100,000us-gaap_DefinedContributionPlanCostRecognized

X

- Definition

Employers matching contribution percentage towards employees contribution.

+ References

No definition available.

+ Details

Name:	sgmo_EmployersMatchingContributionPercentageTowardsEmployeesContribution
Namespace Prefix:	sgmo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration