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NeuVaxTM Acquisition (Purchase Price Consideration and Allocation of Purchase Price) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Apr. 13, 2011
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Calculation of allocable purchase price: |  |  |  |
Fair value of shares issued at closing including escrowed shares expected to be released |  |  | $ 6,367 |
Estimated value of earn-out |  |  | 6,460 | 6,460
Total allocable purchase price | 0 | 0 | 12,827 |
Allocation of purchase price: |  |  |  |
Cash |  |  | 168 |
Prepaid expenses and other current assets |  |  | 14 |
Equipment and furnishings |  |  | 11 |
Goodwill |  |  | 5,898 |
In-process research and development |  |  | 12,864 |
Accounts payable |  |  | (931) |
Accrued expenses and other current liabilities |  |  | (143) |
Notes payable |  |  | (1) |
Deferred tax liability, non-current |  |  | (5,053) |
Total allocable purchase price | $ 0 | $ 0 | $ 12,827 |

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- Definition The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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