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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 |

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