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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disclosure of Foreign Exchange Rates (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
U.S. Dollars      
Disclosure of foreign exchange rates [line items]      
Average rate 1.1405 1.1193 1.1798
Closing rate 1.2271 1.1234 1.1450
Swiss Francs      
Disclosure of foreign exchange rates [line items]      
Average rate 1.0704 1.1121 1.1546
Closing rate 1.0802 1.0854 1.1269
Czech Koruna      
Disclosure of foreign exchange rates [line items]      
Average rate 26.4337 25.6698 25.6452
Closing rate 26.2420 25.4080 25.7240