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COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details)
Aug. 30, 2018
USD ($)
Apr. 17, 2019
USD ($)
Mar. 31, 2019
USD ($)
Oct. 31, 2015
USD ($)
ft²
Other Commitments [Line Items]        
Repayment of mortgage note payable $ (2,500,000)      
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
Scenario, Forecast | Unfavorable Regulatory Action | Pending Litigation        
Other Commitments [Line Items]        
Costs accrued   $ 500,000