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Property, Plant and Equipment - Depreciation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Depreciation Expense [Line Items]        
Total depreciation expense $ 4,469 $ 3,157 $ 12,983 $ 9,537
Cost of revenue        
Depreciation Expense [Line Items]        
Total depreciation expense 2,976 2,284 8,947 6,958
Research and development        
Depreciation Expense [Line Items]        
Total depreciation expense 296 197 829 441
Sales and marketing        
Depreciation Expense [Line Items]        
Total depreciation expense 32 30 90 90
General and administrative        
Depreciation Expense [Line Items]        
Total depreciation expense $ 1,165 $ 646 $ 3,117 $ 2,048