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SHARE-BASED COMPENSATION - Inputs to the Model Used for PSUs Granted (Details) - PSUs
 6 Months Ended
Jun. 30, 2021
€ / shares
Disclosure of Input of Model Used for Performance-Based RSU [Line Items]  
Fair value at grant date (in euros) (in EUR per share) € 21.84
Share price at grant date (in EUR per share) € 13.90
Dividend yield 0.00%
Expected volatility 71.00%
Risk-free interest rate (US government bond yield) 0.31%