Quarterly report pursuant to Section 13 or 15(d)

Nature of Business - Additional Information (Detail)

v3.8.0.1
Nature of Business - Additional Information (Detail)
$ / shares in Units, $ in Millions
3 Months Ended
Jul. 25, 2017
USD ($)
$ / shares
shares
Jun. 14, 2017
shares
Mar. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Nature of Business [Line Items]        
Place of incorporation     Delaware  
Net proceeds from issuance of common stock upon IPO and exercise of overallotment | $ $ 58.0      
Underwriting discounts and commissions | $ 3.1      
Offering expenses | $ $ 3.3      
Stock split, conversion ratio 2.45 100    
Common stock, shares authorized 275,000,000 30,000,000 275,000,000 275,000,000
Authorized capital stock 325,000,000      
Common stock, par value | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Preferred stock, shares authorized 50,000,000   50,000,000 50,000,000
Preferred stock, par value | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Cellectis (Parent) [Member]        
Nature of Business [Line Items]        
Percentage of ownership in outstanding common stock     79.10%  
Common stock, issued and sold 2,500,000      
Net proceeds from issuance of common stock upon IPO and exercise of overallotment | $ $ 20.0      
Outstanding obligation paid to parent | $ $ 5.7      
IPO [Member]        
Nature of Business [Line Items]        
Common stock, issued and sold 8,050,000      
Common stock issued price per share | $ / shares $ 8.00      
Underwriters Option to Purchase Additional Shares [Member]        
Nature of Business [Line Items]        
Common stock, issued and sold 1,050,000