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Commitments and Contingencies - Non-cancelable Material Contractual Commitments (Detail) $ in Thousands	Dec. 31, 2020 USD ($)
Other Commitments [Line Items]
Contractual obligation	$ 21,507
Brammer Bio MA
Other Commitments [Line Items]
Contractual obligation	7,736
Lonza Netherlands, B.V.
Other Commitments [Line Items]
Contractual obligation	$ 13,771

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_CounterpartyNameAxis=sgmo_BrammerBioMAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=sgmo_LonzaNetherlandsBVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: