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Percentage of Revenue from Significant Customers (Detail) (Sales) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Orencia Royalties from Bristol |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 26.00% | 26.00% | 25.00% | 24.00%
Bioprocessing Customer A |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 28.00% | 49.00% | 35.00% | 46.00%
Bioprocessing Customer B |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 10.00% | 8.00% | 12.00% | 11.00%
Bioprocessing Customer C |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 20.00% | 12.00% | 15.00% | 12.00%

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