Quarterly report pursuant to Section 13 or 15(d)

Acquisitions, Investments and Licenses - Summary of Investments (Details)

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Acquisitions, Investments and Licenses - Summary of Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Business Combinations [Abstract]    
Equity method investments $ 19,703  
Variable interest entity, equity method 706  
Equity securities 22,350  
Equity securities with no readily determinable fair value 939  
Warrants and options 1,799  
Total carrying value of investments 45,497 $ 40,642
Equity method investment, underlying equity in net assets $ 15,547