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Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property and Equipment [Abstract]  
Property and Equipment

7. PROPERTY AND EQUIPMENT

Property and equipment consisted of the following at December 31:







 

 

 

 

 

 

 



 

 

 

 

 

 

 



Estimated Useful Life

 

2017

 

2016

Generators and other capital equipment 

1 - 3 years

 

$

 15,754 

 

$

 13,087 

Building under capital lease

15 years

 

 

 14,250 

 

 

 14,250 

Computer and other office equipment

3 years

 

 

 5,873 

 

 

 5,321 

Machinery, equipment and vehicles 

3 - 7 years

 

 

 4,576 

 

 

 3,731 

Furniture and fixtures

3 - 7 years

 

 

 4,366 

 

 

 3,676 

Leasehold improvements

5 - 15 years

 

 

 3,636 

 

 

 3,319 

Construction in progress

N/A

 

 

 1,810 

 

 

 539 

Equipment under capital leases

3 - 5 years

 

 

 221 

 

 

 215 

Total

 

 

 

 50,486 

 

 

 44,138 

Less accumulated depreciation

 

 

 

 (21,737)

 

 

 (14,143)

Property and equipment, net

 

 

$

 28,749 

 

$

 29,995 



Property and equipment depreciation expense was $7,761,  $7,655 and $4,975 for the years ended December 31, 2017, 2016 and 2015. Depreciation related to generators and other capital equipment was $3,574,  $3,591 and $2,944 in 2017, 2016 and 2015. As of December 31, 2017 and 2016, the net carrying value of generators and other capital equipment was $4,656 and $5,692.