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COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Oct. 31, 2015
USD ($)
ft²
Other Commitments [Line Items]      
Repayment of mortgage note payable $ 2,694,000 $ 179,000  
Purchase commitments for inventories $ 5,400,000    
Sophia, Bulgaria      
Other Commitments [Line Items]      
Area of real estate property (in square feet) | ft²     18,745
Monthly cost of office space     $ 5,980