Annual report pursuant to Section 13 and 15(d)

Intangible Assets, Net and Goodwill

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Intangible Assets, Net and Goodwill
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net and Goodwill
Intangible assets, net consisted of the following:
December 31,
(in thousands)
 2019 2018
Intangible assets subject to amortization:
Patents and purchased technology $ 14,198    $ 14,198   
Customer relationships 23,000    23,000   
Gross carrying amount 37,198    37,198   
Accumulated amortization:
Patents and purchased technology (13,311)   (11,981)  
Customer relationships (15,713)   (14,063)  
Accumulated amortization (29,024)   (26,044)  
Net carrying amount 8,174    11,154   
Intangible assets not subject to amortization 115,421    115,421   
Intangible assets, net $ 123,595    $ 126,575   
Amortization expense for intangible assets subject to amortization was $3.0 million for the years ended December 31, 2019 and 2018, respectively, and $3.9 million for the year ended December 31, 2017. At December 31, 2019 and 2018, the Company determined that its goodwill and intangible assets were not impaired.
The following table presents the estimated annual amortization expense for the years 2020 through 2024:
(in thousands)  
2020 $ 2,537   
2021 1,650   
2022 1,650   
2023 1,650   
2024 688