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Property and Equipment, Net
6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Property and equipment, net Property and Equipment, net
Property and equipment, net, consisted of the following (in thousands):
Asset ClassUseful Life
(Years)
June 30, 2020December 31, 2019
Operational equipment
3-10
$12,094  $12,094  
Lab equipment5525  525  
Computer equipment3221  221  
Office furniture and equipment3221  221  
Land-1,047  1,047  
Building3919,508  19,508  
Asset retirement cost20670  670  
Equipment under construction10,881  9,921  
45,167  44,207  
Less: accumulated depreciation(7,553) (6,564) 
Total property and equipment, net$37,614  $37,643  
Property and equipment depreciation expense was $0.5 million and $1.0 million for the three and six months ended June 30, 2020, respectively, and $0.9 million and $1.7 million for the three and six months ended June 30, 2019, respectively. Equipment under construction is comprised of various components being manufactured or installed by the Company, to be used in the McCarran, Nevada facility.