Stock-based compensation and warrants - Summary of Stock-Based Compensation Expense by Award Type (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
---|---|---|
Mar. 31, 2014
|
Mar. 31, 2013
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Share-based compensation expense | $ 2,493 | $ 661 |
Stock Options [Member]
|
||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Share-based compensation expense | 2,477 | 639 |
Restricted Stock [Member]
|
||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Share-based compensation expense | $ 16 | $ 22 |