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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

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- Details
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