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COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details)
3 Months Ended
Aug. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Apr. 17, 2019
USD ($)
Oct. 31, 2015
USD ($)
ft²
Other Commitments [Line Items]          
Repayment of mortgage note payable   $ 0 $ 60,000    
Purchase commitments for inventories   $ 5,800,000      
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        
Scenario, Forecast | Unfavorable Regulatory Action | Pending Litigation          
Other Commitments [Line Items]          
Costs accrued       $ 500,000