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PROPERTY, PLANT, AND EQUIPMENT
 12 Months Ended
Dec. 31, 2019
PROPERTY, PLANT, AND EQUIPMENT  
PROPERTY, PLANT, AND EQUIPMENT

6. PROPERTY, PLANT, AND EQUIPMENT

Property, plant, and equipment consist of the following as of December 31:

 

 

 

 

 

 

 

 

(in thousands)

    

2019

    

2018(1)

Land

 

$

4,566

 

$

4,558

Buildings

 

 

10,275

 

 

10,079

Machinery, furniture, and equipment

 

 

34,984

 

 

26,814

Construction in progress

 

 

3,496

 

 

5,040

 

 

 

53,321

 

 

46,491

Less: accumulated depreciation

 

 

(12,770)

 

 

(8,401)

Property and equipment, net

 

$

40,551

 

$

38,090

(1)

Includes property and equipment acquired in acquisition of WellSpring (Note 2).

Depreciation expense for the years ended December 31, 2019, 2018, and 2017 totaled $4.4 million, $2.1 million, and $1.2 million, respectively. During the years ended December 31, 2019 and 2018, there was $0.2 million and $0.7 million of interest capitalized into construction in progress, respectively.