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Intangible Assets
 12 Months Ended
Dec. 31, 2016
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,
 
 
2016
 
2015
Patents
 
$
1,102

 
$
1,081

Licenses
 
379

 
379

 
 
1,481

 
1,460

Accumulated amortization
 
(466
)
 
(379
)
Intangibles, net
 
$
1,015

 
$
1,081


 
Intangible asset amortization of $0.1 million was recorded for each of the years ended December 31, 2016, 2015 and 2014, respectively. Amortization of these intangible assets over the next five years is expected to be approximately $0.1 million per year.