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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Warranty term one to two years      
Short term investments € 0      
Accounts Receivable, Allowance for Credit Loss, Writeoff 827 € 15    
Gain (loss) derivatives 0      
Warranty expense 266 131 € 433  
Advertising Expense 291 739 € 719  
Operating lease, right of use € 1,895 2,647    
Operating lease, liability   € 2,684    
Accounting Standards Update 2016-02        
Operating lease, right of use       € 3,500
Operating lease, liability       € 3,500
Maximum | Sale and leaseback        
Useful life 7 years