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Fair Value Measurement - Summary of Estimated Fair Value of Free Share Liability Assumptions (Detail) | Dec. 31, 2020 $ / shares | Dec. 31, 2020 € / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2019 € / shares | Oct. 01, 2018 $ / shares
--- | --- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
EUR/ USD exchange rate | 0.82 | 0.82 | 0.91 | 0.91 |
Measurement Input, Share Price |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Sangamo Stock Price (USD) (in dollars per share) | $ 15.61 |  | $ 8.68 |  |
Stock Price Volatility Estimate |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Volatility Estimate | 0.889 | 0.889 | 0.725 | 0.725 |
Exchange Rate Volatility Estimate |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Volatility Estimate | 0.063 | 0.063 | 0.066 | 0.066 |
TxCell S.A. |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Sangamo France Stock Price (EUR) (in Euro per share) |  |  |  |  | $ 2.99
TxCell S.A. | Measurement Input, Share Price |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Sangamo France Stock Price (EUR) (in Euro per share) | € / shares |  | € 3.85 |  | € 2.14 |
TxCell S.A. | Measurement Input Stock Price Correlation |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Estimated correlation Sangamo and Sangamo France stock prices | 1.000 | 1.000 | 1.000 | 1.000 |
TxCell S.A. | Stock Price Volatility Estimate |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Volatility Estimate | 0.889 | 0.889 | 0.725 | 0.725 |

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