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Intangible Assets, Net
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
Intangible assets, net consisted of the following:
(in thousands)March 31,
2020		December 31,
2019		March 31,
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(13,644) (13,311) (12,314) 
Customer relationships(16,125) (15,713) (14,475) 
Total accumulated amortization(29,769) (29,024) (26,789) 
Net carrying amount7,429  8,174  10,409  
Intangible assets not subject to amortization115,421  115,421  115,421  
Intangible assets, net$122,850  $123,595  $125,830  
Amortization expense for intangible assets subject to amortization was $0.7 million for each of the three months ended March 31, 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