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ACQUISITION OF SANGAMO THERAPEUTICS FRANCE S.A.S. - Narrative (Detail) - USD ($) $ / shares in Units, shares in Thousands |  | 3 Months Ended | 32 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Jul. 20, 2018
Business Acquisition [Line Items] |  |  |  |  |
Goodwill impairments |  | $ 0 | $ 0 |  |
Sangamo France | Share purchase agreement and tender offer agreement |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Noncontrolling interest ownership percentage |  | 99.90% |  | 99.90% |
Sangamo France |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred | $ 45,900,000 |  |  |  |
Business acquisition, share price (in dollars per share) | $ 2.99 |  |  |  |
Sangamo France | Share purchase agreement and tender offer agreement |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of equity interests agreed to acquire |  |  |  |  | 100.00%
Number of ordinary shares acquired (in shares) |  |  |  | 453 |
Number of free shares held by the holders (in shares) |  |  |  |  | 477

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