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Intangible Assets
 9 Months Ended
Sep. 28, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

On our Consolidated Balance Sheets at September 28, 2019 and December 29, 2018, Intangible assets, net are shown net of accumulated amortization of $124.0 million and $114.5 million, respectively.

We recorded amortization expense related to intangible assets on the Consolidated Statements of Operations as presented in the following table:
 
Three Months Ended
 
Nine Months Ended
(In thousands)
September 28,
2019
 
September 29,
2018
 
September 28,
2019
 
September 29,
2018
Research and development
$
14

 
$
14

 
$
41

 
$
264

Amortization of acquired intangible assets
3,389

 
3,823

 
10,168

 
13,982

 
$
3,403

 
$
3,837

 
$
10,209

 
$
14,246



During the third quarter of fiscal 2018, we concluded that a certain product line had limited future revenue potential due to a decline in customer demand for that product, and we recorded an impairment charge of $0.6 million to the intangible asset associated with that product. During the second quarter of fiscal 2018, in addition to recurring amortization expense, we recorded an impairment charge relating to intangible assets of $11.9 million in the Consolidated Statements of Operations as a result of the strategic decision to discontinue our millimeter wave business.