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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Tax Cuts And Jobs Act Of 2017, change in tax rate, income tax expense (benefit) $ 11,095,000    
Income tax expense (benefit) 0 $ 0 $ 0
Loss carryforwards 70,335,000    
Tax credit carryforward 335,000    
Estimated limitation on losses generated prior to ownership change date 16,200,000    
Estimated Annual limitation of losses 1,062,000    
Increase of estimated annual limitation of first five years 2,302,000    
Reserve for uncertain income tax positions 0    
Cash held by foreign operations $ 500,000