Quarterly report pursuant to Section 13 or 15(d)

Property, Plant, and Equipment, net

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Property, Plant, and Equipment, net
6 Months Ended
Jun. 30, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment, net
Property, Plant, and Equipment, net

At June 30, 2015 and December 31, 2014, property, plant, and equipment, net consisted of the following (in thousands):
 
June 30,
2015
 
December 31,
2014
Leasehold improvements
$
2,151

 
$
1,592

Furniture and fixtures
1,965

 
2,293

Equipment
18,705

 
17,593

Computer equipment
5,579

 
4,115

Computer software
6,746

 
5,950

Automobiles
246

 
307

Building
2,649

 
2,649

Albatross (aircraft)
425

 
425

Construction in progress
2,295

 
1,501

Total property, plant, and equipment
40,761

 
36,425

Accumulated depreciation
(15,093
)
 
(12,774
)
Property, plant, and equipment, net
$
25,668

 
$
23,651



Depreciation expense for property, plant, and equipment amounted to $2.2 million and $1.7 million for the three months ended June 30, 2015 and 2014, respectively, and $4.2 million and $3.3 million for the six months ended June 30, 2015 and 2014, respectively.
 
Depreciation expense, including software amortization expense, by classification for the three and six months ended June 30, 2015 and 2014 is shown below (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Cost of sales
$
670

 
$
911

 
$
1,337

 
$
1,631

Sales and marketing
251

 
114

 
403

 
237

Product development
326

 
153

 
669

 
323

General and administrative
927

 
520

 
1,798

 
1,142

Total depreciation expense
$
2,174

 
$
1,698

 
$
4,207

 
$
3,333