Income Taxes - Summary of Changes In Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Abstract] | ||
| Unrecognized tax benefit, beginning of year | $ 811 | $ 935 |
| Increase (decrease) related to current year positions | (124) | (124) |
| Unrecognized tax benefit, end of year | $ 687 | $ 811 |