Share-based Compensation - Share-based Compensation Expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
Schedule of Trading Securities and Other Trading Assets [Line Items] | ||||
Total share-based compensation | $ 479 | $ 439 | $ 1,088 | $ 982 |
Stock Option Awards [Member] | ||||
Schedule of Trading Securities and Other Trading Assets [Line Items] | ||||
Total share-based compensation | 327 | 294 | 752 | 687 |
Restricted Stock Units [Member] | ||||
Schedule of Trading Securities and Other Trading Assets [Line Items] | ||||
Total share-based compensation | $ 152 | $ 145 | $ 336 | $ 295 |