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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 145,150,000 148,716,000
Common stock, shares outstanding 145,150,000 148,716,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 2,000,000 2,000,000
Accounts receivable from related parties $ 24,055 $ 26,884
Securities owned, at fair value 119,390 34,895
Preferred Stock Redemption Value 88,456 72,667
WisdomTree ETF [Member]    
Securities owned, at fair value $ 21,180 $ 23,932
Series A Redeemable Convertible Preferred Stock [Member]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 14,750 14,750
Preferred stock, shares issued 14,750 14,750
Preferred stock, shares outstanding 14,750 14,750