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Investments - Other Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Investment        
Impairment of equity investments   $ 20,973 $ 0 $ 0
Kateeva        
Other Investment        
Carrying amount     21,000  
Impairment of equity investments $ 21,000      
Kateeva | Other income (expense), net        
Other Investment        
Impairment of equity investments   $ 21,000    
Kateeva | Maximum        
Other Investment        
Percentage ownership of cost method investee 20.00% 20.00%    
Separate non-marketable investment        
Other Investment        
Amount of investment made     $ 3,500  
Separate non-marketable investment | Maximum        
Other Investment        
Percentage ownership of cost method investee 20.00% 20.00%