Prepaid Expenses - Additional Information (Detail) - USD ($) |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Disclosure Prepaid Expenses And Other Assets Details [Line Items] | ||
| Prepaid expenses | $ 61,097 | $ 34,414 |
| Board Members and Officers [Member] | Clinical Trial Insurance [Member] | ||
| Disclosure Prepaid Expenses And Other Assets Details [Line Items] | ||
| Prepaid expenses | 41,000 | $ 27,000 |
| Board Members and Officers [Member] | Market Exchange Fees [Member] | ||
| Disclosure Prepaid Expenses And Other Assets Details [Line Items] | ||
| Prepaid expenses | $ 20,000 |