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Summary of Revenue Recognized under Various Agreements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2011
Product Information [Line Items] |  |  |  |  |  |  |
Performance of research activities |  | $ 8,000 |  | $ 5,400 |  |  | $ 3,000
Total revenues | $ 1,550 |  | $ 3,048 |  | $ 2,177 | $ 6,546 |
Grant revenue | 101 |  | 1,007 |  | 249 | 2,132 |
National Institute of Allergy and Infectious Diseases |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Grant revenue |  |  | 965 |  |  | 1,839 |
National Institutes of Health |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Grant revenue | 101 |  | 42 |  | 249 | 293 |
Astra Zeneca |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Initial payment | 63 |  | 180 |  | 126 | 360 |
Subsequent payment | 237 |  | 675 |  | 474 | 1,350 |
Performance of research activities | 630 |  | 545 |  | 801 | 1,432 |
Total revenues | $ 930 |  | $ 1,400 |  | $ 1,401 | $ 3,142 |

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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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- Definition Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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