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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2020
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,
20202019
LandN/A$1,340 $1,340 
Buildings and land improvements
15-39
2,486 2,464 
Manufacturing equipment713,261 12,631 
Furniture, fixtures and equipment
5-7
443 277 
Vehicles5140 140 
Hardware and software
3-5
887 398 
Total18,557 17,250 
Less: accumulated depreciation(8,783)(6,590)
Property, plant and equipment, net$9,774 $10,660 
Depreciation expense was $2.2 million, $2.1 million and $1.9 million for the years ended December 31, 2020, 2019 and 2018, respectively, of which $2.0 million, $1.8 million and $1.7 million, respectively, has been allocated to cost of revenues and $0.2 million, $0.3 million and $0.2 million, respectively, is included in depreciation and amortization in the accompanying consolidated statements of operations for the years ended December 31, 2020, 2019 and 2018.