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Intangible Assets, net
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, net
Intangible Assets, net
The following table summarizes our major classes of intangible assets (in thousands):
 
 
December 31,
 
 
2019
 
2018
Patents
 
$
465

 
$
721

Accumulated amortization - Patents
 
(199
)
 
(221
)
Intangibles, net
 
$
266

 
$
500


 
Intangible asset amortization of less than $0.1 million was recorded for the year ended December 31, 2019, compared to $0.1 million for the year ended December 31, 2018. Amortization of intangible assets over the next five years is expected to be less than $0.1 million per year. The weighted-average period over which the amortization remaining at December 31, 2019 is expected to be recognized is approximately 14.9 years.