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Schedule of Future Minimum Office And Vehicle Lease Payments (Detail) - office and vehicle - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Commitments And Contingencies [Line Items] |  |
2019 | $ 1,198,910 |
2020 | 1,623,835 |
2021 | 1,653,101 |
2022 | 1,305,096 |
2023 | 87,957 |
Total | $ 5,868,899 |
2019 |  | $ 1,595,421
2020 |  | 1,623,835
2021 |  | 1,653,101
2022 |  | 1,305,096
2023 |  | 87,957
Total |  | $ 6,265,410

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