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OTHER LONG-TERM LIABILITIES - Provision Presentation According to ASC 715 (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Retirement Indemnity Plans, France [Member]      
Non-current liabilities € 1,032 € 960  
Current liabilities 80 10  
Accumulated other comprehensive income (loss) (111) (67)  
Accrued pension cost 1,000 903 € 815
Defined Benefit Retirement Indemnity Plans, Japan [Member]      
Non-current liabilities 1,241 1,207  
Current liabilities 69 22  
Accumulated other comprehensive income (loss) (130) (136)  
Accrued pension cost € 1,181 € 1,093 € 895