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Revenue - Trade Sale Revenue (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Trade sales receivable $ 1,028,251   $ 1,028,251   $ 1,691,295
Trade sales payable 979,822   979,822   $ 2,180,783
Trade sales revenue $ 575,636 $ 2,259,366 $ 2,543,896 $ 4,508,242