Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 06, 2017
USD ($)
ft²
Options
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Other Commitments [Line Items]              
Operating lease expiration date         2018-06    
Total rent expense under operating lease     $ 0 $ 65,000 $ 154,000 $ 195,000  
Sale-leaseback transaction date         Sep. 06, 2017    
Cash received upon sale of land and other improvements to third party $ 7,000,000         6,957,000  
Lease term 20 years            
Number of lease extension options | Options 4            
Extension term of lease agreement 5 years            
Annual base rent expense   $ 490,000          
Annual base rent   $ 1,400,000          
Minimum net worth required     300,000,000   $ 300,000,000    
Finance obligation     17,200,000   17,200,000   $ 10,100,000
Principal payments due with in next twelve months         0    
Interest expense     349,000 $ 3,000 901,000 46,000  
Due to related parties     1,937,000   1,937,000   1,350,000
Forward purchase commitment amount         7,300,000   1,600,000
Corporate Headquarters [Member]              
Other Commitments [Line Items]              
Office and lab building area | ft² 40,000            
Assets Under Construction Held Under Finance Lease [Member]              
Other Commitments [Line Items]              
Interest expense         897,000 $ 46,000  
Cellectis (Parent) [Member]              
Other Commitments [Line Items]              
Minimum net worth required     300,000,000   300,000,000    
Cellectis (Parent) [Member] | Management Agreement [Member]              
Other Commitments [Line Items]              
Due to related parties     $ 1,900,000   $ 1,900,000   $ 1,400,000
Cellectis (Parent) [Member] | Maximum [Member]              
Other Commitments [Line Items]              
Threshold percentage of ownership in outstanding common stock to enact indemnification agreement         50.00%