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Employee Benefit Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |
Defined contribution plan name | “Sangamo 401(k) Plan” |  |
Defined contribution plan, employer's matching contribution percent | 50.00% | 50.00% | 50.00%
Percentage of employer matching contribution to employee contribution | 8.00% | 8.00% | 6.00%
Maximum percentage limit of employee contributions | 8.00% | 8.00% | 6.00%
Defined contribution plan, maximum employer's contribution per employee | $ 4,000 | $ 4,000 | $ 3,000
Aggregate employer's contributions to defined contribution plan | $ 800,000 | $ 500,000 | $ 300,000

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Name of defined contribution plan designed to provide retirement benefits. Includes, but is not limited to, legal name of plan. + References No definition available. + Details
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