XML 39 R29.htm IDEA: XBRL DOCUMENT
v3.19.2

Fair Value Measurements - Additional Information (Detail) - TxCell S.A. - USD ($) shares in Thousands, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Oct. 01, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Liability recorded on acquisition date |  |  | $ 4,933
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
Estimated fair value liability of free shares |  |  | $ 200
Increase in fair value of free shares | $ 500 |  |
Estimated fair value asset of free shares | $ 400 |  |
Valuation Technique, Option Pricing Model [Member] | Share Purchase Agreement and Tender Offer Agreement |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Estimated fair value liability of free shares |  | $ 200 | $ 200

X
- Definition Business acquisition estimated fair value assets of free shares. + References No definition available. + Details
Name: | sgmo_BusinessAcquisitionEstimatedFairValueAssetsOfFreeShares
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business acquisition estimated fair value liabilities of free shares. + References No definition available. + Details
Name: | sgmo_BusinessAcquisitionEstimatedFairValueLiabilitiesOfFreeShares
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 Increase in fair value of free shares asset and liability. + References No definition available. + Details
Name: | sgmo_IncreaseInFairValueOfFreeSharesAssetAndLiability
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=sgmo_TxCellSAMember
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: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_ValuationTechniqueOptionPricingModelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |