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INTANGIBLE ASSETS, NET
 9 Months Ended
Sep. 30, 2021
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, 2021December 31, 2020September 30, 2020
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)(14,198)(14,198)
Customer relationships(18,600)(17,363)(16,950)
Accumulated amortization(32,798)(31,561)(31,148)
Net carrying amount4,400 5,637 6,050 
Intangible assets not subject to amortization97,921 97,921 115,421 
Intangible assets, net$102,321 $103,558 $121,471 
Amortization expense for intangible assets subject to amortization was $0.4 million and $0.6 million for the three months ended September 30, 2021 and 2020, respectively, and was $1.2 million and $2.1 million for the nine months ended September 30, 2021, and 2020, respectively.
The following table presents the estimated annual amortization expense for the years ending 2021 through 2025:
(in thousands)
2021$1,650 
20221,650 
20231,650 
2024688 
2025—