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Property, Plant and Equipment - Summary of property, plant, and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   $ 68,183
Finance leases $ 212  
Total property, plant and equipment 148,457  
Less: accumulated depreciation and amortization 33,158  
Less: accumulated depreciation and amortization   20,709
Property, plant and equipment, net 115,299  
Property, plant and equipment, net 115,299 47,474
Manufacturing equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 62,521 37,939
Research and development equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 12,342 8,933
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 9,277 7,620
Buildings    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 12,569 0
Finance leases    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   1,108
Software    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 402 274
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 614 433
Vehicles    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 377 210
Land    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 3,995 0
Assets not yet placed in service    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 46,148 $ 11,666