Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.10.0.1
Related-Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
May 22, 2018
Jul. 25, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]              
Due to related parties     $ 1,937,000   $ 1,937,000   $ 1,350,000
Minimum net worth required     300,000,000   300,000,000    
Cellectis (Parent) [Member]              
Related Party Transaction [Line Items]              
Minimum net worth required     $ 300,000,000   $ 300,000,000    
Common stock, issued and sold   2,500,000          
Cellectis (Parent) [Member] | Maximum [Member]              
Related Party Transaction [Line Items]              
Threshold percentage of ownership in outstanding common stock to enact indemnification agreement         50.00%    
Restricted Stock Units [Member] | Cellectis (Parent) [Member]              
Related Party Transaction [Line Items]              
Common stock, issued and sold         63,175    
Common stock issued price per share     $ 19.49   $ 19.49    
EURIBOR 12 [Member] | Cellectis (Parent) [Member]              
Related Party Transaction [Line Items]              
Debt instrument, basis spread on variable rate         5.00%    
Follow-on Public Offering [Member]              
Related Party Transaction [Line Items]              
Common stock, issued and sold 4,057,500            
Common stock issued price per share $ 15.00            
Follow-on Public Offering [Member] | Cellectis (Parent) [Member]              
Related Party Transaction [Line Items]              
Common stock, issued and sold 550,000       550,000    
Common stock issued price per share     $ 15.00   $ 15.00    
Management Agreement [Member] | Cellectis (Parent) [Member]              
Related Party Transaction [Line Items]              
Related party transaction, expenses from transactions with related party     $ 975,000 $ 466,000 $ 1,954,000 $ 1,361,000  
Due to related parties     1,900,000   1,900,000   $ 1,400,000
Selling, General and Administrative [Member] | Management Agreement [Member] | Cellectis (Parent) [Member]              
Related Party Transaction [Line Items]              
Related party transaction, expenses from transactions with related party     918,000 414,000 1,817,000 1,244,000  
Research and Development [Member] | Management Agreement [Member] | Cellectis (Parent) [Member]              
Related Party Transaction [Line Items]              
Related party transaction, expenses from transactions with related party     $ 57,000 $ 52,000 $ 137,000 $ 117,000