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Property, Plant, and Equipment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]      
Depreciation expense included in costs of sales $ 3,447 $ 1,812 $ 374
Depreciation expense included in operating expenses 2,058 1,444 261
Interest costs capitalized $ 0 $ 0 $ 89