Income Taxes - Reconciliation of the Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Abstract] | ||
| Unrecognized tax benefits at the beginning of the period | $ 1,216 | $ 865 |
| Additions for current tax positions | 421 | 220 |
| Changes for previous tax positions | (207) | 131 |
| Unrecognized tax benefits at the end of the period | $ 1,430 | $ 1,216 |