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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS - NARRATIVE (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017	Dec. 31, 2017 USD ($)	Oct. 31, 2015 USD ($) ft²
Other Commitments [Line Items]
Purchase commitments for inventories	$ 5,404,000
Accrued severance and related	948,000		$ 1,242,000
Purchase, NY
Other Commitments [Line Items]
Accrued severance and related	$ 147,000
Customer concentration risk | Trade receivable | 10 Largest Customers
Other Commitments [Line Items]
Concentration receivable risk (as a percent)	27.80%	46.20%
Customer concentration risk | Sales Revenue | 10 Largest Customers
Other Commitments [Line Items]
Concentration receivable risk (as a percent)	41.90%	56.20%
Customer concentration risk | Sales Revenue | McKesson
Other Commitments [Line Items]
Concentration receivable risk (as a percent)	14.50%	16.00%
Customer concentration risk | Sales Revenue | National Distribution & Contracting Inc.
Other Commitments [Line Items]
Concentration receivable risk (as a percent)	5.30%	8.70%
Sophia, Bulgaria
Other Commitments [Line Items]
Area of real estate property (in square feet) | ft²				18,745
Monthly cost of office space				$ 6,300

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