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Revenue Recognized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	$ 882	$ 890	$ 1,969	$ 1,779
National Institutes of Health
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	882	890	1,969	1,779
National Institutes of Health | NIAID Contract
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	750	570	1,740	1,116
National Institutes of Health | All Other
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant revenue	$ 132	$ 320	$ 229	$ 663

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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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