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CONCENTRATION OF RISK - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | [1] | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | [1] | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | [1] | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | [1],[2] | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) supplier | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 74,577,000 | $ 30,214,000 | $ 64,392,000 | $ 29,703,000 | $ 62,312,000 | $ 39,419,000 | $ 58,092,000 | $ 31,223,000 | $ 198,886,000 | $ 191,046,000 | $ 191,031,000
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 |  |  |  |  |  |  |  |  | $ 156,000 | $ 185,000 | $ 118,000
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) |  |  |  |  |  |  |  |  | 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) |  |  |  |  |  |  |  |  | 98.00% | 99.00% | 99.00%
[1] | The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.
[2] | Includes a $33.0 million write down of inventory

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