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CONCENTRATION OF RISK - Additional Information (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) supplier | Sep. 30, 2016 USD ($)
Concentration Risk [Line Items] |  |  |  |
Revenue | $ 61,683,000 | $ 30,214,000 | $ 219,762,000 | $ 124,309,000
Supplier Concentration Risk [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of suppliers from which chemical materials were purchased | supplier |  |  | 1 |
Total Revenue [Member] | Government Contracts Concentration Risk [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue | $ 0 | $ 32,000 | $ 10,000 | $ 148,000
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) | 1.00% | 1.00% | 1.00% | 1.00%
Total Revenue [Member] | Customer Concentration Risk [Member] | Excluding North America [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) | 96.00% | 95.00% | 96.00% | 98.00%

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