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Basic and Diluted Net Loss Per Share - Additional Information (Detail) - shares	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Stock options and RSUs outstanding	11,604,633	8,858,623

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- Definition

Share based compensation arrangement by share based payment award options and restricted stock units outstanding number.

+ References

No definition available.

+ Details

Name:	sgmo_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedStockUnitsOutstandingNumber
Namespace Prefix:	sgmo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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