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Fair Value Measurement - Summary of Estimated Fair Value of Free Share Liability Assumptions (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2019 € / shares | Oct. 01, 2018 $ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USD/ EUR Exchange Rate | 0.91 | 0.87 | 0.91 |
Measurement Input, Share Price |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Sangamo Stock Price (USD) (in usd per share) | $ 8.68 | $ 11.48 |  |
Stock Price Volatility Estimate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Volatility Estimate | 0.725 | 0.799 | 0.725 |
Exchange Rate Volatility Estimate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Volatility Estimate | 0.066 | 0.077 | 0.066 |
Risk Free Rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Risk Free Rate and Cost of Debt by Expected Exercise Date | Varies | Varies |  |
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) | (per share) |  | $ 2.58 | € 2.14 |
TxCell S.A. | Stock Price Volatility Estimate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Volatility Estimate | 0.725 | 0.086 | 0.725 |
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 | 0 | 1.000 |

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