Stock-based Compensation (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
---|---|---|
Mar. 31, 2014
|
Mar. 31, 2013
|
|
Stock-based compensation expense related to share-based payments | ||
Total stock-based compensation expense | $ 2,364 | $ 1,793 |
Research and development
|
||
Stock-based compensation expense related to share-based payments | ||
Total stock-based compensation expense | 1,314 | 1,023 |
General and administrative
|
||
Stock-based compensation expense related to share-based payments | ||
Total stock-based compensation expense | $ 1,050 | $ 770 |