Stock Plans and Stock-Based Compensation (Details 1) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | 78 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
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Components of stock-based compensation | ||||
Total stock-based compensation expense | $ 3,638 | $ 1,469 | $ 2,329 | $ 7,512 |
Employee awards [Member]
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Components of stock-based compensation | ||||
Total stock-based compensation expense | 2,408 | 520 | 215 | 3,206 |
Non-employee awards [Member]
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Components of stock-based compensation | ||||
Total stock-based compensation expense | 664 | 662 | 2,114 | 3,413 |
Non-employee warrants [Member]
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Components of stock-based compensation | ||||
Total stock-based compensation expense | $ 566 | $ 287 | $ 893 |