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Operating Leases - Future Minimum Lease Payments under Operating Leases (Detail)
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Remainder of 2019 $ 439,762
2020 614,721
2021 624,179
2022 624,179
2023 624,179
Thereafter 780,223
Total future lease payments due $ 3,707,243