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Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]  
Summary of Intangible Assets

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

 

 

March 31, 2018

 

 

December 31, 2017

 

Intangible assets

 

$

22,273

 

 

$

2,500

 

Less accumulated amortization

 

 

(3,611

)

 

 

(1,194

)

Total

 

$

18,662

 

 

$

1,306