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NeuVaxTM Acquisition (Additional Information) (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 13, 2011 | Jun. 30, 2013 | Sep. 30, 2012 | Jan. 19, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Feb. 10, 2012 | Jan. 18, 2012
Business Combinations [Abstract] |  |  |  |  |  |  |  |  |
Date of acquisition of Apthera, Inc. | Apr. 13, 2011 |  |  |  |  |  |  |  |
Approximate shares of common stock issued to Apthera's stockholders | 5,000,000 |  |  |  |  |  |  |  |
Future contingent payments | $ 32,000,000 |  |  |  | $ 30,000,000 |  |  |  |
Estimated value of the earn-out consideration | 6,460,000 |  |  |  |  |  | 6,460,000 |  |
Contingent liability |  |  |  | 1,000,000 |  |  |  |  |
Restricted shares of common stock issued |  |  |  | 1,315,849 |  |  |  |  |
Increase in number of milestone shares on obtaining shareholder approval |  |  |  |  |  |  |  |  | $ 0.76
Payment to the former Apthera shareholders in cash |  |  | 35,000 |  |  |  |  |  |
Payment to the former Apthera shareholders in cash at an interest factor |  |  |  |  |  |  |  | 10.00% |
Additional other expense related to fair value of the shares on the date of issuance |  |  |  |  |  | 579,000 |  |  |
MIlestone Payment |  | 1,247,000 |  |  | 2,000,000 |  |  |  |
Shares Issued for Milestone Payment |  | 492,988 |  |  |  |  |  |  |
Increase in the fair value of the contingent liability |  |  |  |  | 926,000 | 2,370,000 |  |  |
Decrease in the fair value of the contingent liability |  |  |  |  |  |  | 109,000 |  |
Fair value of the contingent liability |  |  |  |  | 6,821,000 | 7,142,000 |  |  |
Current contingent liability |  |  |  |  | $ 0 | $ 935,000 |  |  |

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