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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial Assets (Details)
Jul. 08, 2019
USD ($)
Jan. 21, 2019
USD ($)
Oct. 22, 2015
Dec. 31, 2019
USD ($)
loan_agreement
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 05, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of subsidiaries [line items]                
Borrowings       $ 51,386,000 $ 0 $ 6,011,000   $ 217,000
Factoring of receivables | Banco Santander                
Disclosure of subsidiaries [line items]                
Receivables transferred under factoring agreement       3,510,000        
Dynaflows S.A.                
Disclosure of subsidiaries [line items]                
Proportion of ownership interests held by non-controlling interests     33.27%          
Clarice                
Disclosure of subsidiaries [line items]                
Financial assets, at fair value         400,000      
Subsidiaries | Collokia investment                
Disclosure of subsidiaries [line items]                
Financial assets, at fair value       115,000 $ 106,000      
Borrowings       300,000     $ 100,000  
Borrowings, interest rate             2.80%  
Subsidiaries | Wolox                
Disclosure of subsidiaries [line items]                
Financial assets, at fair value       1,841,000        
Borrowings   $ 1,800,000            
Borrowings, interest rate   2.00%            
Borrowing term   18 months            
Subsidiaries | Singularity Education Group                
Disclosure of subsidiaries [line items]                
Financial assets, at fair value       1,280,000        
Borrowings $ 1,250,000              
Borrowings, interest rate 5.00%              
Borrowing term 1 year              
Subsidiaries | The Startups                
Disclosure of subsidiaries [line items]                
Financial assets, at fair value       300,000        
Borrowings       $ 300,000        
Number of purchase agreements | loan_agreement       4        
Minimum | Subsidiaries | The Startups                
Disclosure of subsidiaries [line items]                
Borrowings, interest rate       5.00%        
Maximum | Subsidiaries | The Startups                
Disclosure of subsidiaries [line items]                
Borrowings, interest rate       12.00%