|
Stock Based Compensation (Stock-based compensation expense) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 111 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2014
|
Mar. 31, 2013
|
Mar. 31, 2014
|
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Stock-based compensation expense | $ 1,375 | $ 16 | $ 2,800 |
|
Research and Development [Member]
|
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Stock-based compensation expense | 465 | 2 | |
|
General and Administrative [Member]
|
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Stock-based compensation expense | $ 910 | $ 14 | |