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Significant Accounting Policies - Recently Issued Accounting Standards (Detail) - USD ($) | Dec. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2016
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New accounting pronouncement, modified retrospective method |  |  |
Deferred tax assets, valuation allowance | $ 56,354,793 |  | $ 54,667,237
ASU 2016-09 |  |  |
New accounting pronouncement, modified retrospective method |  |  |
Deferred tax assets for equity compensation |  | $ 98,767 |

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