Annual report pursuant to Section 13 and 15(d)

Acquisitions, Investments, and Licenses - Accounting Method, Carrying Value and Underlying Equity in Net Assets of Unconsolidated Investments (Details)

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Acquisitions, Investments, and Licenses - Accounting Method, Carrying Value and Underlying Equity in Net Assets of Unconsolidated Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-term Investments [Abstract]    
Equity method investments, carrying value $ 2,505  
Variable interest entity, equity method, carrying value 1,116  
Available for sale investments, carrying value 26,313  
Cost method investment 439  
Warrants and options 855  
Total carrying value of investments 31,228 $ 40,642
Equity method Investments, underlying equity in net assets 11,658  
Variable interest entity, equity method, underlying equity in net assets $ 44