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Acquisition of Sangamo France - Summary of Non-controlling Interest (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity attributable to noncontrolling interest, beginning balance |  |  |  | $ 739 |  |  |  |  | $ 739 |  |
Fair value of additional shares acquired |  |  |  |  |  |  |  |  | (321) |  |
Net loss attributable to non-controlling interest | $ (54) | $ (54) | $ (72) | (53) | $ (555) | $ 0 | $ 0 | $ 0 | (233) | $ (555) | $ 0
Stockholders' equity attributable to noncontrolling interest, ending balance | 185 |  |  |  | 739 |  |  |  | 185 | 739 |
Non- Controlling Interest |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity attributable to noncontrolling interest, beginning balance |  |  |  | $ 739 |  |  |  |  | 739 |  |
Stockholders' equity attributable to noncontrolling interest, ending balance | $ 185 |  |  |  | $ 739 |  |  |  | $ 185 | $ 739 |

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