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Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Restricted cash $ 49,726 $ 38,460
Brokerage customers' cash    
Restricted cash 43,495 28,931
Guaranty deposits    
Restricted cash 4,642 732
Deferred distribution payments    
Restricted cash 1,053 8,534
Reserve with Central Bank of Russia    
Restricted cash $ 536 $ 263