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Acquisition of Ceregene - Summary of Estimated Fair Value of Consideration Transferred (Detail) (Ceregene, Inc. [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Ceregene, Inc. [Member]
Business Acquisition [Line Items]
Sangamo shares of common stock	$ 1,200
Contingent earn-out	1,510
Total purchase consideration	$ 2,710

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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