v3.26.1
Operating expenses - Personnel costs and headcount (Details)
€ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
employee
Dec. 31, 2023
EUR (€)
employee
Dec. 31, 2025
USD ($)
employee
Operating expenses        
Number of employees | employee   119 123 77
Amount of provision for restructuring | $       $ 1.1
Expense of restructuring activities € 7,288      
Wages, salaries and similar costs (12,443) € (12,081) € (11,007)  
Payroll taxes (12,718) (3,491) (3,376)  
Provisions for retirement benefit obligations 799 (193) (183)  
Sharebased compensation expense (25,481) (3,580) (3,969)  
Total personnel costs (49,842) € (19,345) (18,535)  
Inventiva S.A        
Operating expenses        
Number of employees | employee   110   60
Inventiva Inc.        
Operating expenses        
Number of employees | employee   9   17
Research and development expenses        
Operating expenses        
Wages, salaries and similar costs (7,757) € (8,493) (8,376)  
Payroll taxes (3,475) (2,343) (2,394)  
Provisions for retirement benefit obligations 680 (124) (124)  
Sharebased compensation expense (3,953) (2,345) (2,673)  
Total personnel costs (14,505) (13,305) (13,568)  
Marketing - business development expenses        
Operating expenses        
Wages, salaries and similar costs (75) (212) (181)  
Payroll taxes (10) (16) (19)  
Sharebased compensation expense (37) (41) (25)  
Total personnel costs (121) (269) (224)  
General and administrative expenses        
Operating expenses        
Wages, salaries and similar costs (4,611) (3,376) (2,450)  
Payroll taxes (9,233) (1,132) (963)  
Provisions for retirement benefit obligations 120 (69) (58)  
Sharebased compensation expense (21,491) (1,194) (1,272)  
Total personnel costs € (35,215) € (5,771) € (4,743)