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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment consisted of the following (in thousands):
Estimated Useful Life (Years)December 31,
20212020
LandN/A$1,340 $1,340 
Buildings and land improvements
15-39
2,451 2,486 
Manufacturing equipment713,924 13,261 
Furniture, fixtures and equipment
5-7
476 443 
Vehicles5161 140 
Hardware and software
3-5
1,683 887 
Assets in progressNA1,880 — 
Total21,915 18,557 
Less: accumulated depreciation(11,223)(8,783)
Property, plant and equipment, net$10,692 $9,774 
Depreciation expense was $2.4 million, $2.2 million and $2.1 million for the years ended December 31, 2021, 2020 and 2019, respectively, of which $2.0 million, $2.0 million and $1.8 million, respectively, was allocated to cost of revenues and $0.4 million, $0.2 million and $0.3 million, respectively, is included in depreciation and amortization in the accompanying consolidated statements of operations for the years ended December 31, 2021, 2020 and 2019.