Customers that Represent Greater than Ten Percent of Billed and Unbilled Collaboration Receivables (Detail) (Accounts Receivable)	12 Months Ended
Dec. 31, 2012 Government contract	Dec. 31, 2011 Chdi Foundation, Inc	Dec. 31, 2011 Glaxo, Smith, Kline	Dec. 31, 2011 Medtronic
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	51.00%	20.00%	13.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 825

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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