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Subsequent Events (Details) - Subsequent Events - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2020
Apr. 30, 2020
Convertible bonds    
Subsequent Events    
Convertible bonds issued   $ 200
convertible bonds interest rate   5.00%
Class A ordinary shares    
Subsequent Events    
Private placement $ 1,100  
Percent of outstanding shares 2.80%