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)
3 Months Ended 12 Months Ended
Sep. 06, 2017
USD ($)
ft²
Options
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Other Commitments [Line Items]        
Operating lease expiration date   2018-05    
Total rent expense under operating lease   $ 77,000 $ 65,000  
Sale-leaseback transaction date   Sep. 06, 2017    
Cash received upon sale of land and other improvements to third party $ 7,000,000      
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    
Percentage of annual base rent   8.00%    
Minimum net worth required   $ 300,000,000    
Gross property and equipment   20,206,000   $ 15,636,000
Finance obligation   14,500,000   10,100,000
Interest expense   123,000   0
Due to related parties   742,000   1,350,000
Forward purchase commitment amount   7,000,000   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]        
Gross property and equipment   7,600,000   3,100,000
Cellectis (Parent) [Member]        
Other Commitments [Line Items]        
Minimum net worth required   300,000,000    
Cellectis (Parent) [Member] | Management Agreement [Member]        
Other Commitments [Line Items]        
Due to related parties   $ 742,000   $ 1,350,000
Cellectis (Parent) [Member] | Maximum [Member]        
Other Commitments [Line Items]        
Threshold percentage of ownership in outstanding common stock to enact indemnification agreement   50.00%