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CONTINGENCIES (Details) € in Thousands		1 Months Ended
CONTINGENCIES (Details) € in Thousands	Sep. 18, 2013 video	Mar. 31, 2021 EUR (€)	Dec. 31, 2009 video lawsuit
EMI/Capitol Records Copyright Infringement Litigation
Contingencies [Line Items]
Number of lawsuits \| lawsuit			2
Number of videos	199		199
EMI/Capitol Records Copyright Infringement Litigation \| Partial Summary Judgement
Contingencies [Line Items]
Number of videos	144
EMI/Capitol Records Copyright Infringement Litigation \| Denied Summary Judgement
Contingencies [Line Items]
Number of videos	35
EMI/Capitol Records Copyright Infringement Litigation \| Judicial Ruling
Contingencies [Line Items]
Number of videos	20
Amended number of videos	1,500
Sony, Universal, Warner Copyright
Contingencies [Line Items]
Penalty payment per day of delay \| €		€ 10