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Property, Plant and Equipment - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation and amortization $ 13,299,000 $ 8,106,000 $ 4,921,000
Assets held-for-sale 0 2,600,000  
Note receivable 4,600,000    
Prepaid and Other Current Assets      
Property, Plant and Equipment [Line Items]      
Note receivable 2,400,000    
Other non-current assets      
Property, Plant and Equipment [Line Items]      
Note receivable 2,200,000    
Cost of goods sold      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization 10,100,000 5,700,000 3,700,000
Research and development expenses      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization 3,100,000 2,400,000 1,200,000
Selling, general and administrative expenses      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization $ 100,000 $ 71,000 $ 13,000