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Revenue - Trade Sale Revenue (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Trade sales receivable $ 1,131,332   $ 1,131,332   $ 1,691,295
Trade sales payable 974,333   974,333   $ 2,180,783
Trade sales revenue $ 1,211,223 $ 2,005,613 $ 3,755,119 $ 6,513,855