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Contractual Obligations (Additional Information) (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Commitment Contingencies Disclosure [Line Items]        
Operating Leases, Rent Expense $ 117,372 $ 115,718 $ 349,168 $ 344,227