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Intangible Assets
6 Months Ended
Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]  
Intangible Assets

5. Intangible Assets

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

 

 

June 30, 2018

 

 

December 31, 2017

 

Intangible assets

 

$

22,273

 

 

$

2,500

 

Less accumulated amortization

 

 

(5,909

)

 

 

(1,194

)

Total

 

$

16,364

 

 

$

1,306

 

 

We recorded $2.3 million and $4.7 million as cost of sales – amortization of intangible assets for the three and six months ended June 30, 2018, respectively. See Note 7.