|
Basis of Presentation (Details 1) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Basis of Presentation [Line Items] | ||||
| Share- based compensation expense Total | $ 1,394 | $ 1,221 | $ 2,103 | $ 1,690 |
|
Research and Development Expense [Member]
|
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| Basis of Presentation [Line Items] | ||||
| Share- based compensation expense Total | 523 | 405 | 948 | 512 |
|
General and administrative expenses [Member]
|
||||
| Basis of Presentation [Line Items] | ||||
| Share- based compensation expense Total | $ 871 | $ 816 | $ 1,155 | $ 1,178 |