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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |
Liquid investments purchased with original maturities | three months or less |  |
Restricted cash | 320 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 320 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |
Percentage of likelihood of indefinite lived intangible assets being impaired | 50.00%sgmo_MinimumPercentageOfLikelihoodOfIndefiniteLivedIntangibleAssetsBeingImpaired |  |
Stock options outstanding | 8,006,380 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 8,405,864 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 9,184,346 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of operating segments | 1 us-gaap_NumberOfOperatingSegments |  |
Shire AG [Member] | Customer Concentration Risk [Member] | Total revenues [Member] |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenues | 57.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember | 68.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember | 51.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_ShireAgMember
Biogen [Member] | Customer Concentration Risk [Member] | Total revenues [Member] |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenues | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_BiogenIdecIncMember |  |
Sigma-Aldrich Corporation [Member] | Customer Concentration Risk [Member] | Total revenues [Member] |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenues |  | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_SigmaAldrichCorporationMember
Dow AgroSciences LLC [Member] | Customer Concentration Risk [Member] | Total revenues [Member] |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenues |  | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_DowAgrosciencesLlcMember | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = sgmo_DowAgrosciencesLlcMember
Minimum [Member] |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of related assets | 3 years |  |
Maximum [Member] |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of related assets | 5 years |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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