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Revenue Recognized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	$ 1,219	$ 658	$ 3,188	$ 2,437
National Institutes of Health
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	1,219	658	3,188	2,437
National Institutes of Health | NIAID Contract
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	1,100	534	2,840	1,650
National Institutes of Health | All Other
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	$ 119	$ 124	$ 348	$ 787

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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=6880815&loc=d3e20235-122688

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