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v2.4.0.6

Segment Customer and Geographic Information - Additional Information (Detail) (Government Grants And Cooperative Agreements) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Government Grants And Cooperative Agreements |  |  |
Revenue, Major Customer [Line Items] |  |  |
Company's total product revenue from significant customers | 1.00% | 7.00% | 6.00%

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- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration