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Intangible Assets, net
 12 Months Ended
Dec. 31, 2017
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,
 
 
2017
 
2016
Patents
 
$
871

 
$
1,102

Licenses
 
379

 
379

 
 
1,250

 
1,481

Accumulated amortization
 
(475
)
 
(466
)
Intangibles, net
 
$
775

 
$
1,015


 
Intangible asset amortization of $0.1 million was recorded for each of the years ended December 31, 2017, 2016 and 2015, respectively. Amortization of these intangible assets over the next five years is expected to be approximately $0.1 million per year.