Income Taxes - Effect Income Tax Rate Reconciliation (Detail) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Abstract] | ||
| Federal statutory rate | 34.00% | 34.00% |
| State income taxes, net of federal benefit | 4.80% | 4.20% |
| Non-deductible expenses | (1.90%) | (2.10%) |
| Income tax credits | 1.90% | 1.60% |
| Valuation allowance | (38.80%) | (37.70%) |
| Effective tax rate | 0.00% | 0.00% |