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Significant Customers that Accounted for More than Ten Percentage of Total Product Revenue (Detail) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Delrus Inc. |  |
Revenue, Major Customer [Line Items] |  |
Percentage of revenue derived from significant customer from Company's total product revenue | 19.00% | 17.00%
Movaco, S.A. |  |
Revenue, Major Customer [Line Items] |  |
Percentage of revenue derived from significant customer from Company's total product revenue | 16.00% | 18.00%
Etablissement Francais du Sang |  |
Revenue, Major Customer [Line Items] |  |
Percentage of revenue derived from significant customer from Company's total product revenue | 16.00% | 30.00%

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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