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Repurposing Charges - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]      
Inventory write-down $ 26,055,000 $ 29,173,000 $ 0
Repurposing charges 0 5,328,000 $ 0
Restructuring reserve $ 0 907,000  
Repurposing Plan      
Restructuring Cost and Reserve [Line Items]      
Inventory write-down   $ 1,940,000