Summary of Future Estimated Annual Amortization Charges (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ||
| 2017 | $ 1,236 | |
| 2018 | 901 | |
| 2019 | 841 | |
| Total intangible assets, Net | $ 2,978 | $ 4,214 |