|
Common Stock (Details 2) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
| Summary of share-based compensation expense for stock options and restricted stock | ||||
| Share-based compensation | $ 855 | $ 709 | $ 1,603 | $ 1,029 |
|
Research and development [Member]
|
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| Summary of share-based compensation expense for stock options and restricted stock | ||||
| Share-based compensation | 415 | 293 | 727 | 428 |
|
General and administrative [Member]
|
||||
| Summary of share-based compensation expense for stock options and restricted stock | ||||
| Share-based compensation | $ 440 | $ 416 | $ 876 | $ 601 |