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Acquisition of Sangamo France - Additional Information (Detail) - USD ($)		2 Months Ended	12 Months Ended
	Oct. 01, 2018	Nov. 23, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 20, 2018
Business Acquisition [Line Items]
Goodwill impairments			$ 0	$ 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%
Business Combination, Consideration Transferred	$ 45,900,000
Purchase price per share (in dollars per share)	$ 2.99
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)			322,000	111,000	25,047,671
Number of free shares held by the holders (in shares)						477,000
Business acquisition estimated fair value liabilities of free shares						$ 200,000
Business acquisition estimated fair value assets of free shares			$ 100,000
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
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent			99.80%	98.70%
Cash paid for shares acquired			$ 700,000

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