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Related-Party Transactions - Additional Information (Detail) - USD ($)			12 Months Ended
	Oct. 20, 2020	May 22, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Follow-on Public Offering [Member]
Related Party Transaction [Line Items]
Common stock, issued and sold	3,750,000	4,057,500
Common stock issued price per share	$ 4.00	$ 15.00
Cellectis [Member]
Related Party Transaction [Line Items]
Minimum net worth required			$ 300,000,000
Cellectis [Member] | Restricted Stock Units [Member]
Related Party Transaction [Line Items]
Common stock, issued and sold					63,175
Common stock issued price per share					$ 19.49
Cellectis [Member] | Follow-on Public Offering [Member]
Related Party Transaction [Line Items]
Common stock, issued and sold	1,250,000	550,000	1,250,000		550,000
Common stock issued price per share			$ 4.00		$ 15.00
General and Administrative Expense [Member] | Cellectis [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			$ 300,000	$ 1,300,000	$ 2,300,000
License and Royalty Fees [Member] | Cellectis [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			$ 200,000	$ 300,000

X

- Definition

The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

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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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