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FAIR VALUE MEASUREMENTS - Summary of Estimated Fair Value of Free Shares Valuation Assumptions (Detail)	Mar. 31, 2021 $ / shares	Mar. 31, 2021 € / shares	Dec. 31, 2020 $ / shares	Dec. 31, 2020 € / shares	Oct. 01, 2018 $ / shares
Stock price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Sangamo stock price (USD) (in dollars per share)	$ 11.83		$ 15.61
Exchange rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
EUR / USD exchange rate	0.84	0.84	0.82	0.82
Stock price volatility estimate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Volatility estimate	0.913	0.913	0.889	0.889
Price volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Volatility estimate	0.063	0.063	0.063	0.063
Sangamo France
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Sangamo France stock price (EUR) (in euros per share)					$ 2.99
Sangamo France | Stock price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Sangamo France stock price (EUR) (in euros per share) | € / shares		€ 2.92		€ 3.85
Sangamo France | Stock price correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated correlation between Sangamo and Sangamo France stock prices	1.000	1.000	1.000	1.000
Sangamo France | Stock price volatility estimate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Volatility estimate	0.913	0.913	0.889	0.889

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