Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Income Tax Disclosure [Abstract] | ||
| In-process research and development | $ 996,154 | $ 996,154 |
| Net operating loss carry forward | 2,995,024 | 1,681,549 |
| R&D credit | 142,721 | 60,213 |
| Share-based compensation | 2,010,742 | 841,524 |
| Accrued expenses | 17,850 | |
| Deferred tax assets gross | 6,144,641 | 3,597,290 |
| Less: valuation allowance | (6,144,641) | (3,597,290) |
| Deferred tax assets, net | $ 0 | $ 0 |