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Revenue - Deferred Revenue (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]          
Deferred revenue $ 2,718,519   $ 2,718,519   $ 1,893,508
Losses on receivables $ 1,845,022 $ 354,814 $ 2,259,136 $ 1,193,593