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FINANCIAL INSTRUMENTS - Fair value measurement recognized in the consolidated statement of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other financial liabilities related to business combinations    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value $ 9,252 $ 9,767
Other financial liabilities related to business combinations | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value 0 0
Other financial liabilities related to business combinations | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value 0 0
Other financial liabilities related to business combinations | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value 9,252 9,767
Foreign exchange forward contracts    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value   12
Foreign exchange forward contracts | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value   0
Foreign exchange forward contracts | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value   12
Foreign exchange forward contracts | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value   0
Mutual funds    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 19,384 4,050
Mutual funds | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 0 0
Mutual funds | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 19,384 4,050
Mutual funds | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 0 0
LETEs    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 396 1,015
LETEs | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 0 0
LETEs | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 396 1,015
LETEs | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 0 0
T-Bills    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   3,493
T-Bills | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   0
T-Bills | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   3,493
T-Bills | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   0
LECAPs    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   77
LECAPs | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   0
LECAPs | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   77
LECAPs | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value   0
Foreign exchange forward contracts    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 1,291 44
Foreign exchange forward contracts | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 0 0
Foreign exchange forward contracts | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 1,291 44
Foreign exchange forward contracts | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 0 0
Convertible notes    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 3,536 106
Convertible notes | Level 1 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 0 0
Convertible notes | Level 2 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value 111 106
Convertible notes | Level 3 of fair value hierarchy    
Disclosure of fair value measurement of liabilities [line items]    
Financial assets, at fair value $ 3,425 $ 0