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REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Contract expiration year	2022
Backlog associated with committed purchase orders from customers	$ 7.1
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%	94.00%
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%	6.00%

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- Definition

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- Definition

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- Definition

Percentage of revenue recorded from provision of services.

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- Definition

Percentage of revenue recorded from sale of materials.

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- Definition

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