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Property and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and Equipment

5. Property and Equipment

 

Major classifications of property and equipment and estimated useful lives were as follows:

 

    Estimated   As of December 31,
    useful lives   2016     2015  
Office furniture and equipment   3 to 10 years   $ 4,835     $ 4,412  
Leasehold improvements   1 to 6 years     1,495       1,488  
Manufacturing and test equipment   2 to 10 years     2,537       2,483  
          8,867       8,383  
Accumulated depreciation and amortization         (7,354 )     (6,794 )
Property and equipment, net       $ 1,513     $ 1,589  

 

Depreciation expense on property and equipment for the years ended December 31, 2016, 2015 and 2014 was $723, $801, and $761, respectively.