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Condensed Statements of Financial Condition (Parenthetical) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Condensed Statements of Financial Condition      
Cash and cash equivalents $ 296,827,349 $ 72,725,833 $ 71,249,689
Restricted cash and cash equivalents $ 66,696,908 $ 10,877,607