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Acquisition of Sangamo France - Additional Information (Detail) - USD ($) |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2018 | Nov. 23, 2018 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 20, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  | $ 262,000 | $ 0 | $ 0 |
Goodwill impairments |  |  |  | $ 0 | $ 0 |  |
TxCell S.A. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of ordinary shares acquired (in shares) | 13,519,036 | 11,528,635 |  |  |  |  |
Percentage of share capital and voting rights acquired |  |  |  |  | 98.20% |  |
Purchase price per share (in dollars per share) | $ 2.99 |  |  |  |  |  |
Number of shares not purchased by the acquirer | 11,981,867 |  |  |  |  |  |
TxCell S.A. | SPA and TOA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of equity interests agreed to acquire |  |  |  |  |  |  | 100.00%
Number of ordinary shares acquired (in shares) |  |  |  | 111,000 | 25,047,671 |  |
Number of free shares held by the holders (in shares) |  |  |  |  |  |  | 477,000
Payments to acquire additional interest in subsidiaries |  |  |  | $ 300,000 |  |  |
Business acquisition estimated fair value liabilities of free shares |  |  |  |  |  |  | $ 200,000
Business acquisition estimated fair value assets of free shares |  |  |  | 200,000 |  |  |
TxCell S.A. | SPA and TOA | Option Pricing Method |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition estimated fair value liabilities of free shares |  |  |  |  | $ 200,000 |  |
TxCell S.A. | SPA and TOA | Former Executive of TxCell |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of ordinary shares acquired (in shares) |  |  | 52,700 |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  | $ 100,000 |  |  |
TxCell S.A. | SPA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of ordinary shares acquired (in shares) | 13,519,036 |  |  |  |  |  |
TxCell S.A. | SPA and TOA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 98.70% |  |  |

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