Stock-Based Compensation - Restricted Stock Units - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Unrecognized stock-based compensation expense, expected recognition weighted-average period | 4 years 3 months 19 days | |
Restricted Stock Units [Member] | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Weighted-average grant date fair value, Granted | $ 23.39 | |
Number of restricted stock units granted | 26,625 | 0 |
Total fair value vested | $ 0 | $ 0 |
Unrecognized stock-based compensation expense related to restricted stock units | $ 5,300 | |
Unrecognized stock-based compensation expense, expected recognition weighted-average period | 4 years 8 months 12 days |