Quarterly report pursuant to Section 13 or 15(d)

Nature of Business - Additional Information (Detail)

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Nature of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
May 22, 2018
Jul. 25, 2017
Sep. 30, 2018
Nature of Business [Line Items]      
Place of incorporation     Delaware
Net proceeds from issuance of common stock upon IPO and exercise of overallotment   $ 58,000  
Underwriting discounts and commissions   3,100  
Offering expenses   $ 3,300  
Net proceeds from issuance of common stock and exercise of overallotment     $ 57,041
Cellectis (Parent) [Member]      
Nature of Business [Line Items]      
Percentage of ownership in outstanding common stock     70.00%
Common stock, issued and sold   2,500,000  
Net proceeds from issuance of common stock and exercise of overallotment   $ 20,000  
Outstanding obligation paid to parent   $ 5,700  
IPO [Member]      
Nature of Business [Line Items]      
Common stock, issued and sold   8,050,000  
Common stock issued price per share   $ 8.00  
Underwriters Option to Purchase Additional Shares [Member]      
Nature of Business [Line Items]      
Common stock, issued and sold 457,500 1,050,000  
Follow-on Public Offering [Member]      
Nature of Business [Line Items]      
Common stock, issued and sold 4,057,500    
Common stock issued price per share $ 15.00    
Underwriting discounts and commissions $ 3,200    
Offering expenses 700    
Net proceeds from issuance of common stock and exercise of overallotment $ 57,000    
Follow-on Public Offering [Member] | Cellectis (Parent) [Member]      
Nature of Business [Line Items]      
Common stock, issued and sold 550,000   550,000
Common stock issued price per share     $ 15.00
Net proceeds from issuance of common stock and exercise of overallotment $ 8,300    
Outstanding obligation paid to parent $ 57,000