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REVENUE RECOGNITION - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |
Deferred revenue | $ 30,331,000 | $ 106,000 |
Deferred revenue offset by reduction of retained earnings |  |  | $ (17,894,000)
Revenue | $ 43,572,000 | $ 55,566,000 |
Contract expiration year | 2022 |  |
Backlog associated with committed purchase orders from customers | $ 6,800 |  |
Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Deferred revenue | 21,300,000 |  |
Deferred revenue offset by reduction of retained earnings | 17,900,000 |  |
Deferred revenue offset by reduction of retained earnings, tax amount | 3,100,000 |  |
Unbilled receivables | 300,000 |  |
Revenue | $ 24,700,000 |  |
Percentage of revenue recorded from sales of materials | 94.00% | 97.00% |
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 | 6.00% | 3.00% |

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