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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment
Major classifications of property and equipment and estimated useful lives were as follows:
 
Estimated
 
As of December 31,
 
useful lives
 
2014
 
2013
Office furniture and equipment
3 to 10 years
 
$
7,234

 
$
6,676

Leasehold improvements
1 to 6 years
 
1,474

 
1,429

Manufacturing and test equipment
2 to 10 years
 
3,023

 
2,681

 
 
 
11,731

 
10,786

Accumulated depreciation and amortization
 
 
(9,692
)
 
(8,961
)
Property and equipment, net
 
 
$
2,039

 
$
1,825