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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Cash and cash equivalents	$ 39,298	$ 49,826	$ 29,894
Restricted cash included in other non-current assets	$ 79,941
Restricted Cash Noncurrent, Asset, Statement of Financial Position [Extensible List]	sgmo:RestrictedCashAndOtherNonCurrentAssets		sgmo:RestrictedCashAndOtherNonCurrentAssets
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows	$ 119,239		$ 29,894

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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