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REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Contract expiration year |  |  | 2022 |
Backlog associated with committed purchase orders from customers | $ 11.3 |  | $ 11.3 |
Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of revenue recorded from sales of materials | 97.00% | 96.00% | 97.00% | 95.00%
Revenue from Contracts with Customers - ASU No. 2014-09 [Member] | Adesis, Inc. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of revenue recorded from provision of services | 3.00% | 4.00% | 3.00% | 5.00%

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