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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]  
Summary of 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

 

 

$

-