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Intangible Assets, Net
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
Intangible assets, net consisted of the following:
(in thousands)June 30,
2020		December 31,
2019		June 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(13,976) (13,311) (12,646) 
Customer relationships(16,538) (15,713) (14,888) 
Total accumulated amortization(30,514) (29,024) (27,534) 
Net carrying amount6,684  8,174  9,664  
Intangible assets not subject to amortization115,421  115,421  115,421  
Intangible assets, net$122,105  $123,595  $125,085  
Amortization expense for intangible assets subject to amortization was $0.7 million for both the three months ended June 30, 2020 and 2019, and was $1.5 million for both the six months ended June 30, 2020 and 2019.
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  
2024688