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Intangible Assets, Net
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
NOTE 3—INTANGIBLE ASSETS, NET
Intangible assets, net consisted of the following:
(in thousands)September 30,
2020		December 31,
2019		September 30,
2019
Intangible assets subject to amortization:
Patents and purchased technology$14,198 $14,198 $14,198 
Customer relationships23,000 23,000 23,000 
Gross carrying amount37,198 37,198 37,198 
Accumulated amortization:
Patents and purchased technology(14,198)(13,311)(12,979)
Customer relationships(16,950)(15,713)(15,300)
Total accumulated amortization(31,148)(29,024)(28,279)
Net carrying amount6,050 8,174 8,919 
Intangible assets not subject to amortization115,421 115,421 115,421 
Intangible assets, net$121,471 $123,595 $124,340 
Amortization expense for intangible assets subject to amortization was $0.6 million and $0.7 million for the three months ended September 30, 2020 and 2019, respectively, and was $2.1 million and $2.2 million for the nine months ended September 30, 2020 and 2019, respectively.
Annual amortization expense is estimated to be as follows for the years 2020 through 2024:
(in thousands)
2020$2,537 
20211,650 
20221,650 
20231,650 
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