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CONCENTRATION OF RISK - Additional Information (Details) - supplier | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplier Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of suppliers from which chemical materials were purchased | 1 |  |
Excluding North America [Member] | Total Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) | 94.00% | 97.00% | 98.00%

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