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Basic and Diluted Net Loss Per Share - Additional Information (Detail) - shares | Jun. 30, 2019 | Jun. 30, 2018
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Earnings Per Share [Abstract] |  |
Stock options and RSUs outstanding (in shares) | 10,155,033 | 8,757,528

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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