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Investments - Contractual Maturities Of Short-Term Investments Designated As Available-For-Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Adjusted Cost      
Due in less than 1 year   $ 0  
Fair Value      
Due in less than 1 year   0  
Carrying value of equity method investments   33,000 $ 25,000
Impairment loss $ 3,500    
Corporate bonds      
Adjusted Cost      
Due in less than 1 year   0  
Fair Value      
Due in less than 1 year   $ 0