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Stockholders' Equity - Summary of Stock Options Outstanding (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 8,006,380 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 7 months 13 days
Options Exercisable Number of Shares of common stock subject to options | 4,929,932 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Options Exercisable Weighted Average Exercise Price | $ 7.21 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Range 1 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 2.55 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeOneMember
Upper Range of Exercise Price | $ 3.45 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeOneMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 950,512 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeOneMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 4 years 4 months 28 days
Options Exercisable Number of Shares of common stock subject to options | 880,721 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeOneMember
Options Exercisable Weighted Average Exercise Price | $ 3.37 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeOneMember
Range 2 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 3.80 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTwoMember
Upper Range of Exercise Price | $ 5.35 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTwoMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 898,399 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTwoMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 4 days
Options Exercisable Number of Shares of common stock subject to options | 874,189 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTwoMember
Options Exercisable Weighted Average Exercise Price | $ 5.27 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTwoMember
Range 3 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.41 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeThreeMember
Upper Range of Exercise Price | $ 5.41 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeThreeMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 985,758 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeThreeMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 7 years 10 months 24 days
Options Exercisable Number of Shares of common stock subject to options | 436,290 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeThreeMember
Options Exercisable Weighted Average Exercise Price | $ 5.41 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeThreeMember
Range 4 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.42 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFourMember
Upper Range of Exercise Price | $ 5.42 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFourMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 50,000 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFourMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 2 months 27 days
Options Exercisable Number of Shares of common stock subject to options | 50,000 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFourMember
Options Exercisable Weighted Average Exercise Price | $ 5.42 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFourMember
Range 5 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.70 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFiveMember
Upper Range of Exercise Price | $ 5.70 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFiveMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 804,771 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFiveMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 11 months 9 days
Options Exercisable Number of Shares of common stock subject to options | 804,771 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFiveMember
Options Exercisable Weighted Average Exercise Price | $ 5.70 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeFiveMember
Range 6 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.94 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSixMember
Upper Range of Exercise Price | $ 11.03 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSixMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 809,679 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSixMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 1 month 13 days
Options Exercisable Number of Shares of common stock subject to options | 713,466 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSixMember
Options Exercisable Weighted Average Exercise Price | $ 6.70 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSixMember
Range 7 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 11.35 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSevenMember
Upper Range of Exercise Price | $ 11.88 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSevenMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 59,250 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSevenMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 2 years 4 months 17 days
Options Exercisable Number of Shares of common stock subject to options | 38,750 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSevenMember
Options Exercisable Weighted Average Exercise Price | $ 11.76 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeSevenMember
Range 8 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 12.12 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeEightMember
Upper Range of Exercise Price | $ 12.12 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeEightMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 942,287 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeEightMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 8 years 11 months 12 days
Options Exercisable Number of Shares of common stock subject to options | 234,592 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeEightMember
Options Exercisable Weighted Average Exercise Price | $ 12.12 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeEightMember
Range 9 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 12.23 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeNineMember
Upper Range of Exercise Price | $ 13.99 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeNineMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 750,324 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeNineMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 4 years 7 months 28 days
Options Exercisable Number of Shares of common stock subject to options | 548,824 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeNineMember
Options Exercisable Weighted Average Exercise Price | $ 13.97 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeNineMember
Range 10 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 14.07 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTenMember
Upper Range of Exercise Price | $ 23.02 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTenMember
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 1,755,400 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTenMember
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 8 years 8 months 1 day
Options Exercisable Number of Shares of common stock subject to options | 348,329 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTenMember
Options Exercisable Weighted Average Exercise Price | $ 14.32 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = sgmo_RangeTenMember

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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