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NET SALES - Deferred revenue (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Accrued expenses and other liabilities        
Disaggregation of revenue:        
Deferred revenue $ 1,119 $ 295 $ 320 $ 496