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OTHER LONG-TERM LIABILITIES - Assumptions (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Retirement Indemnity Plans, France [Member]    
Discount rate 0.60% 0.90%
Salary increase 2.50% 2.50%
Retirement age 65 65
Average retirement remaining service period 24 24
Defined Benefit Retirement Indemnity Plans, Japan [Member]    
Discount rate 0.60% 0.60%
Salary increase 2.50% 2.50%
Retirement age 60 60
Average retirement remaining service period 14 14