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CONCENTRATION OF RISK - Additional Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) supplier | Jun. 30, 2015 USD ($)
Concentration Risk [Line Items] |  |  |  |
Revenue | $ 64,392,000 | $ 58,092,000 | $ 94,095,000 | $ 89,315,000
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 | $ 59,000 | $ 31,000 | $ 116,000 | $ 43,000
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) | 99.00% | 99.00% | 99.00% | 99.00%

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