|
Common Stock (Details 2) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
|
Sep. 30, 2011
|
|
| Summary of share-based compensation expense | ||||
| Share-based compensation | $ 581 | $ 312 | $ 1,610 | $ 866 |
|
Research and development [Member]
|
||||
| Summary of share-based compensation expense | ||||
| Share-based compensation | 243 | 250 | 671 | 493 |
|
General and administrative [Member]
|
||||
| Summary of share-based compensation expense | ||||
| Share-based compensation | $ 338 | $ 62 | $ 939 | $ 373 |