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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Foreign Currency Translation and Accumulated Other Comprehensive Loss) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) Net of Tax [Abstract]      
Material gains or losses from foreign currency exchange transactions $ 0 $ 0 $ 0
Foreign currency translation adjustment (7,855,000) (10,958,000)  
Net unrealized loss on investments (730,000) (730,000)  
Total accumulated other comprehensive loss (8,585,000) (11,688,000)  
Reclassifications out of accumulated other comprehensive loss $ 0 $ 0