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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disclosure of Foreign Exchange Rates (Details)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of foreign exchange rates [line items]      
Closing rate 1.1198    
U.S. Dollars      
Disclosure of foreign exchange rates [line items]      
Average rate 1.1018 1.1297  
Closing rate 1.1198   1.1234
Swiss Francs      
Disclosure of foreign exchange rates [line items]      
Average rate 1.0641 1.1294  
Closing rate 1.0651   1.0854
Czech Koruna      
Disclosure of foreign exchange rates [line items]      
Average rate 26.2970 25.6842  
Closing rate 26.7400   25.4080