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REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract expiration year |  |  |  |  |  |  |  |  | 2022 |  |
Backlog associated with committed purchase orders from customers | $ 6,500 |  |  |  |  |  |  |  | $ 6,500 |  |
Cumulative effect adjustment to reduction of retained earnings |  |  |  |  |  |  |  |  |  |  | $ (17,100)
Revenue | $ 101,729 | $ 97,515 | $ 118,168 | $ 87,765 | $ 70,143 | $ 77,550 | $ 56,149 | $ 43,572 | $ 405,177 | $ 247,414 | $ 335,629
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% | 95.00% | 97.00%
Cumulative effect adjustment to reduction of retained earnings |  |  |  |  | $ (17,100) |  |  |  |  | $ (17,100) |
Revenue |  |  |  |  |  |  |  |  |  | $ 78,900 |
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% | 5.00% | 3.00%

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