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REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Backlog associated with committed purchase orders from customers | $ 11,800 |  | $ 11,800 |
Cumulative catch-up adjustment arising from changes in estimates of transaction price, net |  |  | 9,854 | $ 1,458
Unbilled receivables increase |  |  | $ 17,062 | $ 13,494
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% | 97.00% | 97.00% | 96.00%
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% | 3.00% | 3.00% | 4.00%

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