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Property and Equipment
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
Property and equipment consist of the following:
 
December 31,
(in thousands)
2018
 
2017
Property and equipment consist of the following:
 
 
 
Computer equipment
$
4,691

 
$
3,746

Computer software
1,298

 
1,236

Research equipment
8,445

 
6,379

Furniture and fixtures
4,876

 
2,992

Leasehold improvements
7,425

 
7,193

Vehicles
209

 

Construction in progress
102

 
31

Gross property and equipment
27,046

 
21,577

Less accumulated depreciation
(15,671
)
 
(12,515
)
Net property and equipment
$
11,375

 
$
9,062


Depreciation expense was $4.2 million and $3.6 million for the years ended December 31, 2018 and 2017, respectively, and includes depreciation expenses related to capital lease obligations.