Annual report pursuant to Section 13 and 15(d)

Stockholders Equity - Additional Information (Detail)

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Stockholders Equity - Additional Information (Detail)
12 Months Ended
May 22, 2018
USD ($)
$ / shares
shares
Jul. 25, 2017
USD ($)
$ / shares
shares
Jun. 14, 2017
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Stockholders Equity [Line Items]            
Preferred stock share authorized | shares       50,000,000    
Preferred stock share par value | $ / shares   $ 0.0001   $ 0.0001    
Net proceeds from issuance of common stock upon IPO and exercise of overallotment   $ 58,000,000        
Underwriting discounts and commissions   3,100,000        
Offering expenses   $ 3,300,000        
Net proceeds from issuance of common stock and exercise of overallotment       $ 344,000 $ 57,041,000 $ 57,980,000
Stock split ratio   0.0245 100      
Common stock, shares authorized | shares     30,000,000 275,000,000 275,000,000  
Authorised capital stock | shares   325,000,000        
Common stock, shares designated | shares   275,000,000        
Common stock, par value | $ / shares   $ 0.0001   $ 0.0001 $ 0.0001  
Preferred stock, shares designated | shares   50,000,000        
Repurchase of Common Stock       $ 813,000 $ 230,000  
Cellectis [Member]            
Stockholders Equity [Line Items]            
Common stock, issued and sold | shares   2,500,000        
Net proceeds from issuance of common stock and exercise of overallotment   $ 20,000,000        
Outstanding obligation paid to parent   $ 5,700,000        
IPO [Member]            
Stockholders Equity [Line Items]            
Common stock, issued and sold | shares   8,050,000        
IPO price per share | $ / shares   $ 8.00        
Underwriters Option to Purchase Additional Shares [Member]            
Stockholders Equity [Line Items]            
Common stock, issued and sold | shares 457,500 1,050,000        
Follow-on Public Offering [Member]            
Stockholders Equity [Line Items]            
Common stock, issued and sold | shares 4,057,500          
Underwriting discounts and commissions $ 3,200,000          
Offering expenses 700,000          
Net proceeds from issuance of common stock and exercise of overallotment $ 57,000,000          
Common stock issued price per share | $ / shares $ 15.00          
Follow-on Public Offering [Member] | Cellectis [Member]            
Stockholders Equity [Line Items]            
Common stock, issued and sold | shares 550,000       550,000  
Net proceeds from issuance of common stock and exercise of overallotment $ 8,300,000          
Outstanding obligation paid to parent $ 57,000,000          
Common stock issued price per share | $ / shares         $ 15.00