Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.21.2
Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Jul. 16, 2021
Feb. 19, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, number of shares registered and available for grant 5,613,334      
Common Stock Shares Issued 37,401,876     37,165,196
2017 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, number of shares registered and available for grant 5,710,787      
Number of common shares available for issue   4,299,904    
Calyxt, Inc. Equity Employee Inducement Incentive Plan [Member] | PSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, number of shares registered and available for grant   600,000    
Mr. Blome [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected benefit to earnings from recapture of non-cash stock compensation expense     $ (2.5)