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Inventory - Fair Value Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Inventory Disclosure [Abstract]        
Impairment Charges $ 0 $ 88 $ 5,386 $ 88