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Property and Equipment
9 Months Ended
Sep. 30, 2019
Property Plant And Equipment [Abstract]  
Property and Equipment

Note 5. Property and Equipment

Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of six to ten years for tenant improvements and three to fifteen years for all other property and equipment. Property and equipment consist of the following (in thousands):

 

 

September 30, 2019

 

 

December 31, 2018

 

Computers and software

 

$

496

 

 

$

361

 

Furniture, fixtures, and equipment

 

 

375

 

 

 

339

 

Manufacturing and testing equipment

 

 

3,083

 

 

 

2,503

 

Leasehold improvements

 

 

907

 

 

 

895

 

 

 

 

4,861

 

 

 

4,098

 

Less accumulated depreciation

 

 

(3,070

)

 

 

(2,697

)

 

 

$

1,791

 

 

$

1,401

 

 

Depreciation expense was $105,000 and $156,000 for the three months ended September 30, 2019 and 2018, respectively, and $373,000 and $423,000 for the nine months ended September 30, 2019 and 2018, respectively.