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Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]  
Intangible Assets

6.

Intangible Assets

 

Intangible assets are related to certain capitalized milestone payments. The following table presents intangible assets (in thousands):

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

Intangible assets

 

$

2,500

 

 

$

-

 

Less accumulated amortization

 

 

(1,194

)

 

 

-

 

Total

 

$

1,306

 

 

$

-

 

 

We recorded $1.2 million in amortization expense related to intangible assets during the year ended December 31, 2017. See Note 10. At December 31, 2017, the intangible assets have an estimated remaining useful life of two months. The $1.3 million balance will be fully amortized during the first quarter of 2018. No impairment of intangible assets has been identified during 2017.