Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Effective Income Tax Rate Reconciliation, Percent [Abstract] | ||
| Statutory federal income tax rate | 35.00% | 35.00% |
| Permanent items | (12.00%) | (12.00%) |
| State income taxes, net of federal taxes | 4.00% | 4.00% |
| Change in valuation allowance | (29.00%) | (30.00%) |
| Tax credits claimed | 1.00% | 2.00% |
| Other | 1.00% | 1.00% |
| Effective income tax rate | 0.00% | 0.00% |