Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Long-term Investments [Abstract]    
Equity method investments, carrying value $ 23,338  
Variable interest entity, equity method, carrying value 402  
Available for sale investments, carrying value 12,461  
Cost method investment 1,108  
Warrants and options 3,333  
Total carrying value of investments 40,642 $ 41,139
Equity method Investments, underlying equity in net assets 18,210  
Variable interest entity, equity method, underlying equity in net assets $ 0