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COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details)
Aug. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Apr. 17, 2019
USD ($)
Oct. 31, 2015
USD ($)
ft²
Other Commitments [Line Items]        
Lease term extension   2 years    
Purchase commitments for inventories   $ 3,400,000    
Sophia, Bulgaria        
Other Commitments [Line Items]        
Monthly cost of office space       $ 9,000
Area of real estate property (in square feet) | ft²       20,000
Mortgages        
Other Commitments [Line Items]        
Repayment of mortgage note payable $ 2,500,000      
Unfavorable Regulatory Action | Pending Litigation        
Other Commitments [Line Items]        
Costs accrued     $ 500,000