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Intangible Assets, Net (Tables)
6 Months Ended
Jun. 30, 2020
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):

 

 

 

June 30, 2020

 

 

December 31, 2019

 

Intangible assets

 

$

19,773

 

 

$

19,773

 

Less accumulated amortization

 

 

(19,773

)

 

 

(17,273

)

Total

 

$

-

 

 

$

2,500