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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 20, 2020 | May 22, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stockholders Equity [Line Items] |  |  |  |  |
Preferred stock share authorized |  |  | 50,000,000.0 |  |
Preferred stock share par value |  |  | $ 0.0001 |  |
Net proceeds from issuance of common stock and exercise of overallotment |  |  | $ 14,249 | $ 344 | $ 57,041
Repurchase of Common Stock |  |  |  | $ 800 | $ 200
Follow-on Public Offering [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Common stock, issued and sold | 3,750,000 | 4,057,500 |  |  |
Common stock issued price per share | $ 4.00 | $ 15.00 |  |  |
Net proceeds from issuance of common stock and exercise of overallotment | $ 14,000 | $ 57,000 |  |  |
Underwriting discounts and commissions |  | 3,200 |  |  |
Offering expenses |  | $ 700 |  |  |
After deduction of placement, agent fees and other offering expenses | $ 1,000 |  |  |  |
Follow-on Public Offering [Member] | Cellectis [Member] |  |  |  |  |
Stockholders Equity [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
Net proceeds from issuance of common stock and exercise of overallotment | $ 5,000 | $ 8,300 |  |  |
Outstanding obligation paid to parent | $ 14,000 | $ 57,000 |  |  |
Underwriters Option to Purchase Additional Shares [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Common stock, issued and sold |  | 457,500 |  |  |

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