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Revenue - Trade Sale Revenue (Detail) - USD ($)	3 Months Ended		9 Months Ended
Revenue - Trade Sale Revenue (Detail) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Trade sales receivable	$ 886,223		$ 886,223		$ 956,999
Trade sales payable	804,354		804,354		$ 892,543
Trade sales revenue	$ 1,781,124	$ 1,211,223	$ 3,786,046	$ 3,755,119