Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Income Tax Disclosure [Abstract] | ||
| Beginning balance | $ 935 | $ 215 |
| Increases in tax positions for prior years | 48 | 40 |
| Decreases in tax positions for prior years | (18) | |
| Settlements | 0 | 698 |
| Ending balance | $ 983 | $ 935 |