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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant, and equipment
Property, plant and equipment are carried at cost less accumulated depreciation and are depreciated using the straight-line method over the following estimated useful lives:
LandNot amortized
Buildings30 years
Leasehold improvementsShorter of lease term or estimated useful life
Furniture and fixtures3 years
Manufacturing equipment
5 to 10 years
Research and development equipment
5 to 10 years
Software and computer equipment3 years
Vehicles5 years
A summary of property, plant, and equipment as of December 31, 2020 and 2019, is as follows:
December 31,
(in thousands)20202019
Manufacturing equipment$62,521 $37,939 
Research and development equipment12,342 8,933 
Leasehold improvements9,277 7,620 
Building12,569 — 
Finance leases212 1,108 
Software402 274 
Furniture and fixtures614 433 
Vehicles377 210 
Land3,995 — 
Assets not yet placed in service46,148 11,666 
Total property, plant and equipment$148,457 $68,183 
Less: accumulated depreciation and amortization33,158 20,709 
Property, plant and equipment, net$115,299 $47,474