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NET SALES - Timing of revenue recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of revenue:        
Net sales $ 67,259 $ 40,818 $ 145,634 $ 99,937
Products transferred at point in time        
Disaggregation of revenue:        
Net sales 67,259 40,818 145,634 99,937
Products transferred over time        
Disaggregation of revenue:        
Net sales $ 0 $ 0 $ 0 $ 0