Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.7.0.1
Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Millions
Jul. 25, 2017
USD ($)
$ / shares
shares
Jun. 14, 2017
shares
Jun. 30, 2017
a
ft²
$ / shares
shares
Subsequent Event [Line Items]      
Stock split, conversion ratio   100  
Common stock, shares authorized   30,000,000 30,000,000
Common stock, par value | $ / shares     $ 0.0001
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Net proceeds from issuance of common stock upon IPO and exercise of overallotment | $ $ 58.3    
Underwriting discounts and commissions | $ 3.1    
Offering expenses | $ $ 3.0    
Stock split, conversion ratio 2.45    
Authorized capital stock 325,000,000    
Common stock, shares authorized 275,000,000    
Common stock, par value | $ / shares $ 0.0001    
Preferred stock, shares authorized 50,000,000    
Preferred stock, par value | $ / shares $ 0.0001    
Cellectis (Parent) [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
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 price per share | $ / shares $ 8    
Corporate Headquarters [Member]      
Subsequent Event [Line Items]      
Area of land | a     11
Office and lab building area | ft²     35,000
IPO [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Common stock, issued and sold 8,050,000    
Over-Allotment Option [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Common stock, issued and sold 1,050,000