Quarterly report pursuant to Section 13 or 15(d)

Nature of Business - Additional Information (Detail)

v3.7.0.1
Nature of Business - Additional Information (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Jul. 25, 2017
USD ($)
$ / shares
shares
Jun. 14, 2017
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Nature of Business [Line Items]        
Place of incorporation     Delaware  
Stock split, conversion ratio   100    
Common stock, shares authorized | shares   30,000,000 30,000,000  
Common stock, par value | $ / shares     $ 0.0001  
Accumulated deficit     $ (34,795) $ (28,568)
Subsequent Event [Member]        
Nature of Business [Line Items]        
Net proceeds from issuance of common stock upon IPO and exercise of overallotment $ 58,300      
Underwriting discounts and commissions 3,100      
Offering expenses $ 3,000      
Stock split, conversion ratio 2.45      
Common stock, shares authorized | shares 275,000,000      
Common stock, par value | $ / shares $ 0.0001      
Subsequent Event [Member] | Cellectis (Parent) [Member]        
Nature of Business [Line Items]        
Common stock, issued and sold | shares 2,500,000      
Net proceeds from issuance of common stock upon IPO and exercise of overallotment $ 20,000      
Outstanding obligation paid to parent $ 5,700      
Subsequent Event [Member] | IPO [Member]        
Nature of Business [Line Items]        
Common stock, issued and sold | shares 8,050,000      
Common stock issued price per share | $ / shares $ 8.00      
Subsequent Event [Member] | Over-Allotment Option [Member]        
Nature of Business [Line Items]        
Common stock, issued and sold | shares 1,050,000