XML 100 R38.htm IDEA: XBRL DOCUMENT
v3.22.0.1

FAIR VALUE MEASUREMENTS - Summary of Estimated Fair Value of Free Share Liability Assumptions (Detail) | Dec. 31, 2020 $ / shares | Dec. 31, 2020 € / shares | Oct. 01, 2018 $ / shares
--- | --- | --- | ---
Stock price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Sangamo Stock Price (USD) (in dollars per share) | $ 15.61 |  |
Exchange Rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
EUR/ USD exchange rate | 0.82 | 0.82 |
Stock price volatility estimate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Volatility Estimate | 0.889 | 0.889 |
Price volatility |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Volatility Estimate | 0.063 | 0.063 |
Sangamo France |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Sangamo France Stock Price (EUR) (in Euro per share) |  |  | $ 2.99
Sangamo France | Stock price |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Sangamo France Stock Price (EUR) (in Euro per share) | € / shares |  | € 3.85 |
Sangamo France | Stock price correlation |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Estimated correlation between Sangamo and Sangamo France stock prices | 1.000 | 1.000 |
Sangamo France | Stock price volatility estimate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Volatility Estimate | 0.889 | 0.889 |

X
- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of input used to measure derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_DerivativeLiabilityMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901 + Details
Name: | us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputSharePriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=sgmo_MeasurementInputExchangeRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputOptionVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=sgmo_MeasurementInputStockPriceCorrelationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |