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Inventory - Fair Value Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]        
Impairment Charges $ 54 $ 5,919 $ 5,440 $ 6,007