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Related-Party Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Oct. 20, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Follow-on Public Offering [Member]
Related Party Transaction [Line Items]
Common stock, issued and sold	3,750,000
Common stock issued price per share	$ 4.00
Cellectis [Member]
Related Party Transaction [Line Items]
Minimum net worth required		$ 300.0
Cellectis [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Threshold percentage of ownership in outstanding common stock to enact indemnification agreement		50.00%
Cellectis [Member] | Follow-on Public Offering [Member]
Related Party Transaction [Line Items]
Common stock, issued and sold	1,250,000		1,250,000
Common stock issued price per share			$ 4.00
Management Fees [Member] | Cellectis [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party				$ 1.3

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Per share or per unit amount of equity securities issued.

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