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Employee Benefit Plan - Additional Information (Detail) (USD $) | 12 Months Ended
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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 | $ 2,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount | $ 1,500 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount |
Aggregate employers contributions to defined contribution plan | $ 200,000 us-gaap_DefinedContributionPlanCostRecognized | $ 100,000 us-gaap_DefinedContributionPlanCostRecognized | $ 100,000 us-gaap_DefinedContributionPlanCostRecognized

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- 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

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

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

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- 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

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- 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