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Acquired Intangible Assets
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets Acquired Intangible Assets

The following table presents details of the Company's intangible assets subject to amortization as of the dates presented:
 
 
 
September 30, 2019
 
December 31, 2018
 
Useful
Lives
(Years)
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Trade names
10
 
$
1,040

 
$
(520
)
 
$
520

 
$
1,040

 
$
(442
)
 
$
598

Developed technology
10
 
2,980

 
(1,490
)
 
1,490

 
2,980

 
(1,266
)
 
1,714

Customer relationships
10
 
860

 
(430
)
 
430

 
860

 
(366
)
 
494

 
 
 
$
4,880

 
$
(2,440
)
 
$
2,440

 
$
4,880

 
$
(2,074
)
 
$
2,806



Acquired intangible assets are amortized using the straight-line method over their estimated useful life, which approximates the expected use of these assets. Amortization expense amounted to $122 and $366 for each of the three and nine months ended September 30, 2019 and 2018. Amortization expense of $2,440 will be recognized over the next five years, or $488 per year.