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Contractual Obligations (Future Minimum Payments Required Under Operating Lease) (Detail)
Sep. 30, 2018
USD ($)
Future Minimum Payments Required Under Operating Lease [Line Items]  
2018 (3 months remaining) $ 110,546
2019 442,185
2020 382,702
2021 7,632
2022 8,904
Total $ 951,969