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Major Customers, Partnerships and Strategic Alliances - Agreement with Sigma-Aldrich Corporation - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Oct. 31, 2009 | Jul. 31, 2007
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Research and development | $ 14,980,000 us-gaap_ResearchAndDevelopmentExpense | $ 12,083,000 us-gaap_ResearchAndDevelopmentExpense |  |
Sigma-Aldrich Corporation [Member] |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Research program to develop laboratory research reagents |  |  |  | 3 years
Upfront license fee |  |  | 20,000,000 sgmo_UpfrontLicenseFee / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember |
Public offering, common stock shares issued |  |  | 636,133 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember |
Amount received on commercial license fees | 5,000,000 us-gaap_LicenseAndServicesRevenue / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember |  |  |
Reduced royalty rate | 10.50%sgmo_ReducedRoyaltyRate / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember |  |  |
Funding available under the amended agreement | 25,000,000 sgmo_AdditionalMilestoneReceivableUnderAgreement / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember |  |  |
Milestone payments received | 0 sgmo_MilestonePaymentsReceived / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember |  |  |
Sigma-Aldrich Corporation [Member] | Upfront license fee [Member] |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Upfront license fee |  |  | 15,100,000 sgmo_UpfrontLicenseFee / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_UpfrontLicenseFeesMember |
Common stock issued under license agreement |  |  | 4,900,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = sgmo_UpfrontLicenseFeesMember |
Sigma-Aldrich Corporation [Member] | License agreement terms [Member] |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Royalty revenues expected to be received |  |  | 5,000,000 sgmo_RoyaltyRevenuesExpectedToBeReceived / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |
Research and development | $ 200,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember | $ 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember / us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis = us-gaap_LicenseAgreementTermsMember |  |

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- Definition Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d),(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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