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OTHER LONG-TERM LIABILITIES - Reconciliation of Pension Cost Components (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Retirement Indemnity Plans, France [Member]      
Benefit obligations at beginning of year € 969 € 976 € 895
Service cost 88 68 67
Interest cost 9 16 14
Net loss or (gain)   2  
Actuarial (gain) or loss 45 (93)  
Amortization of net prior service cost 1 1 1
Benefit obligations at end of year 1,111 969 976
Unrecognized actuarial (gain) loss 94 48 141
Unrecognized prior service cost 17 18 20
Accrued pension cost 1,000 903 815
Defined Benefit Retirement Indemnity Plans, Japan [Member]      
Benefit obligations at beginning of year 1,230 1,311 1,182
Service cost 123 140 131
Interest cost 7 6 6
Amortization of net loss 1 27 26
Actuarial (gain) or loss (1) (294)  
Benefits paid (5) (3) (94)
Exchange rate impact (44) 42 (60)
Benefit obligations at end of year 1,310 1,230 1,311
Unrecognized actuarial (gain) loss 130 136 416
Accrued pension cost € 1,181 € 1,093 € 895