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NET SALES SERVICE REVENUE AND ACCOUNTS RECEIVABLE (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk [Line Items] |  |
Clinical research grants | $ 278 |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration Risk, Percentage | 50.00% | 33.00%
Sales Revenue, Net [Member] | Minimum [Member] | Customer Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration Risk, Percentage | 15.00% | 15.00%
Sales Revenue, Net [Member] | Maximum [Member] | Customer Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Concentration Risk, Percentage | 20.00% | 18.00%

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