|
Stock-based Compensation (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2014
|
Jun. 30, 2013
|
Jun. 30, 2014
|
Jun. 30, 2013
|
|
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 2,132 | $ 1,747 | $ 4,496 | $ 3,540 |
|
Research and Development Expense [Member]
|
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| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | 1,189 | 1,002 | 2,503 | 2,025 |
|
General and Administrative Expense [Member]
|
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| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 943 | $ 745 | $ 1,993 | $ 1,515 |