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Build-to-Suit Lease - Additional Information (Detail) | 1 Months Ended
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Dec. 31, 2015 USD ($) ft² Option
Operating Leased Assets [Line Items] |
Property leased | ft² | 41,400
Operating lease expiration period | 5 years
Number of lease term extension options | Option | 2
Costs capitalized | $ 0
Build-to-suit lease obligation | $ 0
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

X
- Definition Build-to-suit lease obligations. + References No definition available. + Details
Name: | sgmo_BuildToSuitLeaseObligations
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- 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

X
- 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

X
- 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

X
- 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

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