Stockholders' Equity - Share-Based Compensation Expense (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Schedule of Trading Securities and Other Trading Assets [Line Items] | |||
| Total stock-based compensation | $ 1,424 | $ 1,302 | $ 1,253 |
| Stock Option Awards [Member] | |||
| Schedule of Trading Securities and Other Trading Assets [Line Items] | |||
| Total stock-based compensation | 992 | 917 | 789 |
| Restricted Stock Units [Member] | |||
| Schedule of Trading Securities and Other Trading Assets [Line Items] | |||
| Total stock-based compensation | $ 432 | $ 385 | $ 464 |