Income Taxes - Additional Information (Detail) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Line Items] | ||
| Valuation allowance | $ (3,960,000) | $ (3,310,000) |
| Expiration of carry forwards loss | 2035 | |
| Research tax credit expiration period | 2035 | |
| Liability for uncertain tax positions | $ 0 | $ 0 |
| Federal Income Tax [Member] | ||
| Income Tax Disclosure [Line Items] | ||
| Net operating loss carryforwards | 35,300,000 | |
| Research tax credit | 331,000 | |
| State Income Tax [Member] | ||
| Income Tax Disclosure [Line Items] | ||
| Net operating loss carryforwards | 29,700,000 | |
| Research tax credit | $ 168,000 | |
| Earliest Tax Year [Member] | ||
| Income Tax Disclosure [Line Items] | ||
| Open tax year subject to tax examination | 2012 | |
| Latest Tax Year [Member] | ||
| Income Tax Disclosure [Line Items] | ||
| Open tax year subject to tax examination | 2015 | |