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Build-to-Suit Lease - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 ft² Option | Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items] |  |
Property leased | ft² | 41,400 |
Lease expiration date |  | Dec. 31, 2021
Operating lease expiration period | 5 years |
Number of lease term extension options | Option | 2 |
Costs capitalized | $ |  | $ 3.9
Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Lease agreement, extendable lease term | 10 years |

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- Definition Build to suit lease, costs capitalized. + References No definition available. + Details
Name: | sgmo_BuildToSuitLeaseCostsCapitalized
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Build-to-suit lease, property leased. + References No definition available. + Details
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Namespace Prefix: | sgmo_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating leases number of extension options. + References No definition available. + Details
Name: | sgmo_OperatingLeasesNumberOfExtensionOptions
Namespace Prefix: | sgmo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |