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REVENUE RECOGNITION - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation Of Revenue [Line Items]        
Backlog associated with committed purchase orders from customers $ 27.2   $ 27.2  
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% 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% 6.00% 3.00% 4.00%