XML 41 R29.htm IDEA: XBRL DOCUMENT
v3.21.2

FAIR VALUE MEASUREMENTS - Narrative (Detail) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jul. 20, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Purchase of additional Sangamo France shares | $ 119,000 | $ 237,000 |  |
Sangamo France | Share purchase agreement and tender offer agreement |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of free shares held by the holders (in shares) |  |  |  | 477,000
Purchase of additional Sangamo France shares | $ 1,100,000 |  |  |
Number of free shares outstanding subject to purchase (in shares) | 0 |  |  |
Business Acquisitions, Fair Value of Free Shares' Asset | $ 0 |  | $ 0 |

X
- Definition Business acquisition, number of free shares held by the holders. + References No definition available. + Details
Name: | sgmo_BusinessAcquisitionNumberOfFreeSharesHeldByHolders
Namespace Prefix: | sgmo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Acquisition, Number Of Free Shares Outstanding Subject To Purchase + References No definition available. + Details
Name: | sgmo_BusinessAcquisitionNumberOfFreeSharesOutstandingSubjectToPurchase
Namespace Prefix: | sgmo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business Acquisitions, Fair Value of Free Shares' Asset + References No definition available. + Details
Name: | sgmo_BusinessAcquisitionsFairValueOfFreeSharesAsset
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow associated with the purchase of noncontrolling interest during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=sgmo_SangamoFranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=sgmo_SharePurchaseAgreementAndTenderOfferAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |