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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment  
Property, Plant and Equipment

5.  Property, Plant and Equipment

 

Property, plant and equipment at December 31, 2019 and 2018 consists of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

    

December 31,

    

December 31,

 

 

 

2019

 

2018

 

Leasehold improvements

 

$

862

 

$

214

 

Software, machinery and equipment

 

 

31,514

 

 

27,058

 

Property, plant, and equipment

 

 

32,376

 

 

27,272

 

Less: accumulated depreciation

 

 

(17,417)

 

 

(14,403)

 

Property, plant, and equipment, net

 

$

14,959

 

$

12,869

 

 

Depreciation expense related to property, plant and equipment was $3.6 million, $2.6 million, and $1.9 million for the years ended December 31, 2019, 2018 and 2017, respectively. Upon the adoption of ASC 842, the Company reclassified property and equipment, subject to a finance lease, to right of use assets. See Note 18, Commitments and Contingencies – Finance Leases as Lessee.