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Property and Equipment
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

Major classifications of property and equipment and estimated useful lives were as follows:
 
Estimated
 
As of December 31,
 
useful lives
 
2015
 
2014
Office furniture and equipment
3 to 10 years
 
$
4,412

 
$
7,234

Leasehold improvements
1 to 6 years
 
1,488

 
1,474

Manufacturing and test equipment
2 to 10 years
 
2,483

 
3,023

 
 
 
8,383

 
11,731

Accumulated depreciation and amortization
 
 
(6,794
)
 
(9,692
)
Property and equipment, net
 
 
$
1,589

 
$
2,039



Depreciation expense on property and equipment for the years ended December 31, 2015 and 2014 was $801 and $761, respectively.