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COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 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 5,404,000      
Accrued severance and related $ 95,000   $ 1,242,000  
Sophia, Bulgaria        
Other Commitments [Line Items]        
Area of real estate property (in square feet) | ft²       18,745
Monthly cost of office space       $ 5,980