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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Computation of Basic and Diluted Earnings Per Share |
|  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic and diluted net loss per share (in thousands, except per share amounts): |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (69,949 | ) |  | $ | (48,597 | ) |  | $ | (57,308 | )
Denominator for basic and diluted net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 170,469 |  |  |  | 125,101 |  |  |  | 82,463 |
Basic and diluted net loss per share |  | $ | (0.41 | ) |  | $ | (0.39 | ) |  | $ | (0.69 | )
|  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Stock options and stock awards |  |  | 15,561 |  |  |  | 11,101 |  |  |  | 7,288 |
Warrants |  |  | 12,714 |  |  |  | 25,729 |  |  |  | 25,734 |
|  |  | 28,275 |  |  |  | 36,830 |  |  |  | 33,022 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration