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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract] |  |  |
Rent expenses | $ 0.7 | $ 0.6 | $ 0.6

X
- Definition Rental expenses. + References No definition available. + Details
Name: | sgmo_RentalExpenses
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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