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NET SALES - Timing of revenue recognition (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:        
Net sales $ 75,843 $ 68,778 $ 221,477 $ 168,715
Products transferred at point in time        
Disaggregation of revenue:        
Net sales 75,843 68,778 221,477 168,715
Products transferred over time        
Disaggregation of revenue:        
Net sales $ 0 $ 0 $ 0 $ 0