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Summary of Revenue Recognized under Agreement with GSK (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2011 | Mar. 31, 2014 National Institutes of Health | Mar. 31, 2013 National Institutes of Health | Dec. 31, 2008 Glaxo, Smith, Kline | Mar. 31, 2014 Glaxo, Smith, Kline | Mar. 31, 2013 Glaxo, Smith, Kline | Mar. 31, 2014 Astra Zeneca | Mar. 31, 2013 Astra Zeneca | Mar. 31, 2014 National Institute Of Allergy And Infectious Diseases | Mar. 31, 2013 National Institute Of Allergy And Infectious Diseases
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Initial payment |  |  |  |  |  | $ 10,000 | $ 631 | $ 357 | $ 180 | $ 180 |  |
Subsequent payment |  |  |  |  |  |  |  |  | 675 |  |  |
Milestone revenue |  |  | 12,000 |  |  |  |  |  | 887 | 346 |  |
Total revenues | 3,498 | 2,085 |  |  |  |  | 631 | 357 | 1,742 | 526 |  |
Grant revenue | $ 1,125 | $ 760 |  | $ 251 | $ 162 |  |  |  |  |  | $ 874 | $ 598

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- Definition Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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