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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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