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Intangible Assets, Net (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]  
Summary of Intangible Assets, Net

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

 

 

 

December 31,

 

 

 

2018

 

 

2017

 

Intangible assets

 

$

19,773

 

 

$

2,500

 

Less accumulated amortization

 

 

(8,056

)

 

 

(1,194

)

Total

 

$

11,717

 

 

$

1,306