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Subsequent Events (Details) - Subsequent Event - At-the-market Stock Offering $ in Millions	2 Months Ended
	Feb. 19, 2021 USD ($) shares
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction (in shares) | shares	1,034,762
Sale of stock, consideration received on transaction, gross	$ 16.1
Consideration received from sale of stock	$ 15.7

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- Definition

Sale of Stock, Consideration Received on Transaction, Gross

+ References

No definition available.

+ Details

Name:	sgmo_SaleOfStockConsiderationReceivedOnTransactionGross
Namespace Prefix:	sgmo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=sgmo_AtTheMarketStockOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: