|
Common Stock (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 75 Months Ended | |
|---|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
|
|
| Components of stock-based compensation | |||
| Total stock-based compensation expense | $ 2,173 | $ 787 | $ 6,048 |
|
Employee awards [Member]
|
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| Components of stock-based compensation | |||
| Total stock-based compensation expense | 1,336 | 359 | 2,071 |
|
Non-employee awards [Member]
|
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| Components of stock-based compensation | |||
| Total stock-based compensation expense | 412 | 192 | 3,225 |
|
Non-employee warrants [Member]
|
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| Components of stock-based compensation | |||
| Total stock-based compensation expense | $ 425 | $ 231 | $ 752 |