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NeuVaxTM Acquisition (Pro Forma Net Loss and Pro Forma Net Loss Per Common Share) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Business Combinations [Abstract] |
Net loss from continuing operations | $ (4,700)
Net loss from discontinued operations | $ (8,078)
Net loss per common share, continuing operations | $ (0.12)
Net loss per common share, discontinued operations | $ (0.21)
Net loss per common share | $ (0.34)

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