Significant Accounting Policies - Additional Information (Detail) - USD ($) |
Sep. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Accounting Policies [Abstract] | ||
| Uninsured portion of cash balance | $ 13,561,418 | $ 5,916,143 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. No definition available.
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