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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 ft² | Dec. 31, 2016 USD ($) ft² Property | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |
Additional property available under lease | Property |  | 3 |  |
Lease expiration date |  | Dec. 31, 2021 |  |
Property leased | 41,400 |  |  |
Rent expenses | $ |  | $ 1.0 | $ 0.9 | $ 0.7
Operating Lease One [Member] | Research and Office Space [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Area of space leased |  | 7,700 |  |
Lease expiration date |  | Jan. 31, 2018 |  |
Operating Lease Two [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Area of space leased |  | 6,200 |  |
Lease expiration date |  | Jul. 31, 2021 |  |
Operating Lease Three [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Lease expiration date |  | Dec. 31, 2021 |  |
Property leased |  | 41,400 |  |

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

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- Definition Commitments and contingencies. + References No definition available. + Details
Name: | sgmo_CommitmentsAndContingenciesLineItems
Namespace Prefix: | sgmo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of land subject to a ground lease. + References No definition available. + Details
Name: | us-gaap_LandSubjectToGroundLeases
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition The number of units (items of property) under operating lease arrangements. + References No definition available. + Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=sgmo_PropertySubjectToOperatingLeaseOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=sgmo_ResearchAndOfficeSpaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=sgmo_PropertySubjectToOperatingLeaseTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=sgmo_PropertySubjectToOperatingLeaseThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |